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------------------------------------------------------------------------------
-- GtkAda - Ada95 binding for Gtk+/Gnome --
-- --
-- Copyright (C) 1998-2000 E. Briot, J. Brobecker and A. Charlet --
-- Copyright (C) 1998-2018, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the Free --
-- Software Foundation; either version 3, or (at your option) any later --
-- version. This library is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
------------------------------------------------------------------------------
with Ada.Containers.Doubly_Linked_Lists;
with Ada.Tags; use Ada.Tags;
with Cairo; use Cairo;
with Gdk.Types.Keysyms; use Gdk.Types.Keysyms;
with Glib; use Glib;
with Glib.Main; use Glib.Main;
with Glib.Object; use Glib.Object;
with Gtk.Accel_Group; use Gtk.Accel_Group;
with Gtk.Enums; use Gtk.Enums;
with Gtk.Handlers; use Gtk.Handlers;
with Gtk.Widget; use Gtk.Widget;
with System; use System;
package body Gtkada.Canvas_View.Views is
use Gdouble_Elementary_Functions;
Min_Animation_Interval : constant Duration := 2.0 * 0.017;
-- (in seconds). This is computed for a refresh rate of 60Hs,
-- with 1s / 60.
-- The animation loop will not do anything if called more often than that.
Animation_Interval : constant Guint := 30;
-- (in milliseconds). How long we give the application to perform one
-- iteration of the animation loop.
procedure On_Monitored_Destroyed
(Minimap : System.Address; Monitored : System.Address);
pragma Convention (C, On_Monitored_Destroyed);
-- Called when the view monitored by a minimap is being destroyed.
procedure On_Destroy_Minimap (Minimap : access Gtk_Widget_Record'Class);
-- Called when the minimap is being destroyed
procedure On_Monitored_Viewport_Changed
(Minimap : not null access GObject_Record'Class);
-- Called when the viewport has changed in the monitored view
function On_Minimap_Item_Event
(View : not null access GObject_Record'Class;
Event : Event_Details_Access)
return Boolean;
-- React to events in the minimap
procedure Start_Continuous_Scrolling
(Self : not null access Canvas_View_Record'Class;
Dx, Dy : Model_Coordinate := 0.0);
function Do_Continuous_Scroll (Self : Canvas_View) return Boolean;
-- Start or cancel any continuous scrolling that might exist.
package View_Sources is new Glib.Main.Generic_Sources (Canvas_View);
procedure Move_Dragged_Items
(Self : not null access Canvas_View_Record'Class;
Dx, Dy : Model_Coordinate;
From_Initial : Boolean);
-- Move all selected items (part of the current drag operation) by the
-- specified amount (from their initial position if From_Initial is true,
-- or from their current position otherwise)).
package Animator_Lists is new Ada.Containers.Doubly_Linked_Lists
(Animator_Access);
use Animator_Lists;
type Animation_Data is new Base_Animation_Data with record
Last_Run : Ada.Calendar.Time := No_Time;
Queue : Animator_Lists.List;
Current : Animator_Lists.Cursor := Animator_Lists.No_Element;
end record;
type Animation_Data_Access is access all Animation_Data;
procedure On_Animate_Destroy (View : in out Canvas_View);
-- Called when the animation queue terminates
function On_Animate (View : Canvas_View) return Boolean;
-- Perform one step of animation
procedure Animation_Iteration
(Self : not null access Canvas_View_Record'Class;
Current : Ada.Calendar.Time;
Max_Time : Duration);
-- Animate as many items from the queue as possible, spending at most
-- Max_Time seconds (or at least not starting a new animator if the
-- previous one ended more Max_Time seconds after the start).
-- Current is the current time. It can be set to No_Time to indicate that
-- all animations should be completed.
type Position_Animator is new Animator with record
Pos_X : Animation_Value;
Pos_Y : Animation_Value;
end record;
overriding function Execute
(Self : not null access Position_Animator;
Progress : Animation_Progress) return Animation_Status;
type Scale_Animator is new Animator with record
Scale : Animation_Value;
Preserve : Model_Point := No_Point;
end record;
overriding function Execute
(Self : not null access Scale_Animator;
Progress : Animation_Progress) return Animation_Status;
type Scroll_Animator is new Animator with record
Topleft_X : Animation_Value;
Topleft_Y : Animation_Value;
end record;
overriding function Execute
(Self : not null access Scroll_Animator;
Progress : Animation_Progress) return Animation_Status;
------------------
-- Snap_To_Grid --
------------------
function Snap_To_Grid
(Self : not null access Canvas_View_Record'Class;
Pos : Model_Coordinate;
Size : Model_Coordinate) return Model_Coordinate
is
GX : Model_Coordinate;
begin
if Self.Snap.Margin = 0.0 then
return Pos;
end if;
-- Find the closest grid position to the left of Pos
GX := Gdouble (Gint (Pos / Self.Grid_Size)) * Self.Grid_Size;
if abs (Pos - GX) < Self.Snap.Margin then
return GX;
end if;
-- Find the closest grid position to the right of Pos
GX := GX + Self.Grid_Size;
if abs (Pos - GX) < Self.Snap.Margin then
return GX;
end if;
-- Find the closest grid position to the left of Pos + size
GX := Gdouble (Gint ((Pos + Size) / Self.Grid_Size)) * Self.Grid_Size;
if abs (Pos + Size - GX) < Self.Snap.Margin then
return GX - Size;
end if;
-- Find the closest grid position to the right of Pos + size
GX := GX + Self.Grid_Size;
if abs (Pos + Size - GX) < Self.Snap.Margin then
return GX - Size;
end if;
return Pos;
end Snap_To_Grid;
---------------------
-- Draw_Grid_Lines --
---------------------
procedure Draw_Grid_Lines
(Self : not null access Canvas_View_Record'Class;
Style : Gtkada.Style.Drawing_Style;
Context : Draw_Context;
Area : Model_Rectangle)
is
Tmp : Gdouble;
begin
if Style.Get_Fill /= Null_Pattern then
Set_Source (Context.Cr, Style.Get_Fill);
Paint (Context.Cr);
end if;
if Self.Grid_Size /= 0.0 then
New_Path (Context.Cr);
Tmp := Gdouble (Gint (Area.X / Self.Grid_Size)) * Self.Grid_Size;
while Tmp < Area.X + Area.Width loop
Move_To (Context.Cr, Tmp, Area.Y);
Rel_Line_To (Context.Cr, 0.0, Area.Height);
Tmp := Tmp + Self.Grid_Size;
end loop;
Tmp := Gdouble (Gint (Area.Y / Self.Grid_Size)) * Self.Grid_Size;
while Tmp < Area.Y + Area.Height loop
Move_To (Context.Cr, Area.X, Tmp);
Rel_Line_To (Context.Cr, Area.Width, 0.0);
Tmp := Tmp + Self.Grid_Size;
end loop;
Style.Finish_Path (Context.Cr);
end if;
end Draw_Grid_Lines;
--------------------
-- Draw_Grid_Dots --
--------------------
procedure Draw_Grid_Dots
(Self : not null access Canvas_View_Record'Class;
Style : Gtkada.Style.Drawing_Style;
Context : Draw_Context;
Area : Model_Rectangle)
is
TmpX, TmpY : Gdouble;
begin
if Style.Get_Fill /= Null_Pattern then
Set_Source (Context.Cr, Style.Get_Fill);
Paint (Context.Cr);
end if;
if Self.Grid_Size /= 0.0 then
New_Path (Context.Cr);
TmpX := Gdouble (Gint (Area.X / Self.Grid_Size)) * Self.Grid_Size;
while TmpX < Area.X + Area.Width loop
TmpY := Gdouble (Gint (Area.Y / Self.Grid_Size)) * Self.Grid_Size;
while TmpY < Area.Y + Area.Height loop
Rectangle (Context.Cr, TmpX - 0.5, TmpY - 0.5, 1.0, 1.0);
TmpY := TmpY + Self.Grid_Size;
end loop;
TmpX := TmpX + Self.Grid_Size;
end loop;
Style.Finish_Path (Context.Cr);
end if;
end Draw_Grid_Dots;
-------------------------------------
-- On_Item_Event_Scroll_Background --
-------------------------------------
function On_Item_Event_Scroll_Background
(View : not null access Glib.Object.GObject_Record'Class;
Event : Event_Details_Access)
return Boolean
is
Self : constant Canvas_View := Canvas_View (View);
Area, B : Model_Rectangle;
X, Y : Model_Coordinate;
begin
if Self.Model /= null
and then Event.Toplevel_Item = null
then
if Event.Event_Type = Button_Press
and then Event.Button = 1
then
-- Enable scrolling by dragging the background. However, there is
-- no point showing an area where there is no item, so we limit
-- the scrolling.
Event.Allowed_Drag_Area :=
Self.Model.Bounding_Box (Margin => View_Margin / Self.Get_Scale);
-- Event.Dragging_Scrolls := True;
return True;
elsif Event.Event_Type = In_Drag then
-- Compute the area that we are allowed to make visible. This
-- is the combination of the allowed area and the currently
-- visible one.
X := Self.Topleft_At_Drag_Start.X
- (Event.Root_Point.X
- Self.Last_Button_Press.Root_Point.X) / Self.Scale;
Y := Self.Topleft_At_Drag_Start.Y
- (Event.Root_Point.Y
- Self.Last_Button_Press.Root_Point.Y) / Self.Scale;
if Self.Last_Button_Press.Allowed_Drag_Area /=
Drag_Anywhere
then
Area := Self.Get_Visible_Area;
B := Self.Last_Button_Press.Allowed_Drag_Area;
Union (B, Area);
X := Model_Coordinate'Max (X, B.X);
X := Model_Coordinate'Min (X, B.X + B.Width - Area.Width);
Y := Model_Coordinate'Max (Y, B.Y);
Y := Model_Coordinate'Min (Y, B.Y + B.Height - Area.Height);
end if;
Self.Center_On ((X, Y), X_Pos => 0.0, Y_Pos => 0.0);
end if;
end if;
return False;
end On_Item_Event_Scroll_Background;
---------------------------
-- Cancel_Inline_Editing --
---------------------------
procedure Cancel_Inline_Editing
(Self : not null access Canvas_View_Record'Class) is
begin
if Self.Inline_Edit.Item /= null then
Self.Inline_Editing_Finished (Self.Inline_Edit.Item);
Self.Inline_Edit.Item := null;
Self.Remove (Self.Get_Child);
end if;
end Cancel_Inline_Editing;
--------------------------------
-- Inline_Editing_In_Progress --
--------------------------------
function Inline_Editing_In_Progress
(Self : not null access Canvas_View_Record'Class)
return Boolean is
begin
return Self.Inline_Edit.Item /= null;
end Inline_Editing_In_Progress;
--------------------------
-- Start_Inline_Editing --
--------------------------
procedure Start_Inline_Editing
(Self : not null access Canvas_View_Record'Class;
Item : not null access Abstract_Item_Record'Class)
is
W : Gtk_Widget;
begin
Cancel_Inline_Editing (Self);
W := Item.Edit_Widget (Self);
if W /= null then
Self.Inline_Edit.Item := Abstract_Item (Item);
Self.Add (W); -- also queues a resize, so calls On_Size_Allocate
W.Show_All;
W.Grab_Focus;
Self.Inline_Editing_Started (Item);
end if;
end Start_Inline_Editing;
------------------------
-- On_Item_Event_Edit --
------------------------
function On_Item_Event_Edit
(View : not null access Glib.Object.GObject_Record'Class;
Event : Event_Details_Access)
return Boolean
is
Self : constant Canvas_View := Canvas_View (View);
begin
if Event.Item /= null then
if Event.Event_Type = Double_Click
or else (Event.Event_Type = Key_Press
and then Event.Key = GDK_Return)
then
Start_Inline_Editing (Self, Event.Item);
return True;
end if;
end if;
return False;
end On_Item_Event_Edit;
-----------------------------
-- On_Item_Event_Move_Item --
-----------------------------
function On_Item_Event_Move_Item
(View : not null access Glib.Object.GObject_Record'Class;
Event : Event_Details_Access)
return Boolean
is
Self : constant Canvas_View := Canvas_View (View);
Alloc : Gtk_Allocation;
P : View_Point;
begin
if Event.Event_Type = In_Drag
and then not Self.Dragged_Items.Is_Empty
then
-- Disable snapping when shift is pressed.
Event.Allow_Snapping := (Event.State and Shift_Mask) = 0;
Self.Last_Button_Press.Allow_Snapping := Event.Allow_Snapping;
-- The use of Topleft is to take into account the continuous
-- scrolling
Move_Dragged_Items
(Self,
Dx => (Self.Topleft.X - Self.Topleft_At_Drag_Start.X)
+ (Event.Root_Point.X
- Self.Last_Button_Press.Root_Point.X) / Self.Scale,
Dy => (Self.Topleft.Y - Self.Topleft_At_Drag_Start.Y)
+ (Event.Root_Point.Y
- Self.Last_Button_Press.Root_Point.Y) / Self.Scale,
From_Initial => True);
-- Should we do automatic scrolling of the view ?
Self.Get_Allocation (Alloc);
P := Self.Model_To_View (Event.M_Point);
if P.X < View_Coordinate (Alloc.X)
+ Self.Continuous_Scroll.Margin
then
Start_Continuous_Scrolling
(Self, Dx => -Self.Scale * Self.Continuous_Scroll.Speed);
elsif P.X >
View_Coordinate (Alloc.X + Alloc.Width)
- Self.Continuous_Scroll.Margin
then
Start_Continuous_Scrolling
(Self, Dx => Self.Scale * Self.Continuous_Scroll.Speed);
elsif P.Y < View_Coordinate (Alloc.Y)
+ Self.Continuous_Scroll.Margin
then
Start_Continuous_Scrolling
(Self, Dy => -Self.Scale * Self.Continuous_Scroll.Speed);
elsif P.Y >
View_Coordinate (Alloc.Y + Alloc.Height)
- Self.Continuous_Scroll.Margin
then
Start_Continuous_Scrolling
(Self, Dy => Self.Scale * Self.Continuous_Scroll.Speed);
else
Cancel_Continuous_Scrolling (Self);
end if;
Self.Queue_Draw;
elsif Event.Event_Type = Start_Drag then
-- Remove the waypoints for all the links that will be impacted.
declare
S : Item_Sets.Set;
procedure Reset_Wp
(Link : not null access Abstract_Item_Record'Class);
procedure Add_Item
(Item : not null access Abstract_Item_Record'Class);
procedure Add_Item
(Item : not null access Abstract_Item_Record'Class)
is
begin
S.Include (Abstract_Item (Item));
end Add_Item;
procedure Reset_Wp
(Link : not null access Abstract_Item_Record'Class)
is
begin
Canvas_Link (Link).Set_Waypoints ((1 .. 0 => <>));
end Reset_Wp;
begin
-- Self.Dragged_Items is not available yet
Self.Model.For_Each_Item (Add_Item'Access, Selected_Only => True);
Self.Model.For_Each_Link (Reset_Wp'Access, From_Or_To => S);
end;
elsif Event.Event_Type = End_Drag
and then Self.Avoid_Overlap
then
declare
use Item_Drag_Infos;
C : Item_Drag_Infos.Cursor := Self.Dragged_Items.First;
Do_Not_Move : Item_Sets.Set;
begin
while Has_Element (C) loop
Do_Not_Move.Include (Element (C).Item);
Next (C);
end loop;
C := Self.Dragged_Items.First;
while Has_Element (C) loop
Reserve_Space
(Self,
Rect => Element (C).Item.Model_Bounding_Box,
Do_Not_Move => Do_Not_Move,
Duration => Self.Avoid_Overlap_Duration);
Next (C);
end loop;
end;
elsif Event.Event_Type = Button_Press
and then Event.Toplevel_Item /= null
and then Event.Button = 1
then
-- Enable moving the item anywhere
Event.Allowed_Drag_Area := Drag_Anywhere;
Self.Model.Raise_Item (Event.Toplevel_Item);
return True;
end if;
return False;
end On_Item_Event_Move_Item;
--------------------------------
-- On_Item_Event_Zoom_Generic --
--------------------------------
function On_Item_Event_Zoom_Generic
(View : not null access Glib.Object.GObject_Record'Class;
Event : Event_Details_Access)
return Boolean is
begin
return On_Item_Event_Zoom
(View, Event, Modifier, Factor, Duration, Easing);
end On_Item_Event_Zoom_Generic;
------------------------
-- On_Item_Event_Zoom --
------------------------
function On_Item_Event_Zoom
(View : not null access Glib.Object.GObject_Record'Class;
Event : Event_Details_Access;
Modifier : Gdk.Types.Gdk_Modifier_Type;
Factor : Gdouble;
Duration : Standard.Duration;
Easing : Easing_Function)
return Boolean
is
Self : constant Canvas_View := Canvas_View (View);
S : Gdouble;
begin
if Self.Model /= null and then Event.Event_Type = Scroll then
if Event.State = Modifier then
if Event.Button = 5 then
S := Self.Get_Scale * Factor;
else
S := Self.Get_Scale / Factor;
end if;
if Duration > 0.0 then
Start
(Animate_Scale
(Self, S, Preserve => Event.M_Point,
Duration => Duration, Easing => Easing),
Self);
else
Self.Set_Scale (S, Preserve => Event.M_Point);
end if;
Cancel_Inline_Editing (Self);
return True;
end if;
end if;
return False;
end On_Item_Event_Zoom;
--------------------------
-- On_Item_Event_Select --
--------------------------
function On_Item_Event_Select
(View : not null access Glib.Object.GObject_Record'Class;
Event : Event_Details_Access)
return Boolean
is
Self : constant Canvas_View := Canvas_View (View);
begin
if Self.Model /= null then
if Event.Item = null
or else not Self.Model.Is_Selectable (Event.Toplevel_Item)
then
case Event.Event_Type is
when Button_Press =>
if (Event.State and Get_Default_Mod_Mask) = 0 then
Self.Model.Clear_Selection;
end if;
when others =>
null;
end case;
else
Self.Model.Raise_Item (Event.Toplevel_Item);
case Event.Event_Type is
when Button_Press =>
if Self.Model.Is_Selected (Event.Toplevel_Item) then
if (Event.State and Get_Default_Mod_Mask) = 0 then
null; -- do nothing, preserve current selection
else
Self.Model.Remove_From_Selection (Event.Item);
Self.Model.Remove_From_Selection
(Event.Item.Get_Toplevel_Item);
end if;
else
if (Event.State and Get_Default_Mod_Mask) = 0 then
Self.Model.Clear_Selection;
end if;
Self.Model.Add_To_Selection
(Event.Item.Get_Toplevel_Item);
end if;
when others =>
null;
end case;
end if;
end if;
return False; -- always pass the event through
end On_Item_Event_Select;
------------------
-- Move_To_Item --
------------------
function Move_To_Item
(Self : not null access Canvas_View_Record'Class;
Item : not null access Abstract_Item_Record'Class;
Dir : Gtk.Enums.Gtk_Direction_Type;
Ignore_Links : Boolean := True)
return Abstract_Item
is
Box : constant Model_Rectangle := Item.Model_Bounding_Box;
Result : Abstract_Item := null;
Best : Model_Coordinate := Model_Coordinate'Last;
Best_Center : Model_Coordinate := Model_Coordinate'Last;
Best_Is_Centered : Boolean := False;
procedure Do_Item (It : not null access Abstract_Item_Record'Class);
procedure Do_Item (It : not null access Abstract_Item_Record'Class) is
B : constant Model_Rectangle := It.Model_Bounding_Box;
D, C : Model_Coordinate := Gdouble'Last;
Centered : Boolean;
begin
if Ignore_Links and then It.Is_Link then
return;
end if;
case Dir is
when Dir_Tab_Forward | Dir_Right =>
if B.X > Box.X + Box.Width then
-- Whether It is on the same "row" as Item (this is defined
-- computed so that any item in the same row gets precedence
-- other items farther away).
Centered := not
(B.Y + B.Height < Box.Y or else B.Y > Box.Y + Box.Height);
-- D is the vertical distance
D := Gdouble'Min (abs (B.X - Box.X - Box.Width), D);
-- C is the vertical distance between the centers
C := Gdouble'Min
(abs (Box.Y - B.Y + (Box.Height - B.Height) / 2.0), C);
end if;
when Dir_Tab_Backward | Dir_Left =>
if B.X + B.Width < Box.X then
Centered := not
(B.Y + B.Height < Box.Y or else B.Y > Box.Y + Box.Height);
D := Gdouble'Min (abs (B.X + B.Width - Box.X), D);
C := Gdouble'Min
(abs (Box.Y - B.Y + (Box.Height - B.Height) / 2.0), C);
end if;
when Dir_Up =>
if B.Y + B.Height < Box.Y then
Centered := not
(B.X + B.Width < Box.X or else B.X > Box.X + Box.Width);
D := Gdouble'Min (abs (B.Y + B.Height - Box.Y), D);
C := Gdouble'Min
(abs (Box.X - B.X + (Box.Width - B.Width) / 2.0), C);
end if;
when Dir_Down =>
if B.Y > Box.Y + Box.Height then
Centered := not
(B.X + B.Width < Box.X or else B.X > Box.X + Box.Width);
D := Gdouble'Min (abs (B.Y - Box.Y - Box.Height), D);
C := Gdouble'Min
(abs (Box.X - B.X + (Box.Width - B.Width) / 2.0), C);
end if;
end case;
if Best_Is_Centered then
if Centered and then D < Best then
Best := D;
Result := Abstract_Item (It);
end if;
else
if C < Best_Center then
Best_Is_Centered := Centered;
Best_Center := C;
Best := D;
Result := Abstract_Item (It);
end if;
end if;
end Do_Item;
begin
Self.Model.For_Each_Item (Do_Item'Access);
if Result = null then
return Abstract_Item (Item);
else
return Result;
end if;
end Move_To_Item;
----------------------------------------
-- On_Item_Event_Key_Navigate_Generic --
----------------------------------------
function On_Item_Event_Key_Navigate_Generic
(View : not null access Glib.Object.GObject_Record'Class;
Event : Event_Details_Access)
return Boolean
is
Self : constant Canvas_View := Canvas_View (View);
Item : Abstract_Item;
begin
if Self.Model /= null
and then Event.State = Modifier
and then Event.Item /= null
then
case Event.Key is
when GDK_Up | GDK_KP_Up =>
Item := Move_To_Item
(Self, Event.Item, Dir_Up, Ignore_Links);
when GDK_Down | GDK_KP_Down =>
Item := Move_To_Item
(Self, Event.Item, Dir_Down, Ignore_Links);
when GDK_Left | GDK_KP_Left =>
Item := Move_To_Item
(Self, Event.Item, Dir_Left, Ignore_Links);
when GDK_Right | GDK_KP_Right =>
Item := Move_To_Item
(Self, Event.Item, Dir_Right, Ignore_Links);
when others =>
return False;
end case;
if Item /= null then
Cancel_Inline_Editing (Self);
Self.Model.Clear_Selection;
Self.Model.Add_To_Selection (Item);
Self.Scroll_Into_View (Item);
end if;
return True;
end if;
return False;
end On_Item_Event_Key_Navigate_Generic;
---------------------------------------
-- On_Item_Event_Key_Scrolls_Generic --
---------------------------------------
function On_Item_Event_Key_Scrolls_Generic
(View : not null access Glib.Object.GObject_Record'Class;
Event : Event_Details_Access)
return Boolean
is
Self : constant Canvas_View := Canvas_View (View);
Box : Model_Rectangle;
Dx, Dy : Model_Coordinate := 0.0;
begin
if Self.Model /= null
and then Event.State = Modifier
then
case Event.Key is
when GDK_Up | GDK_KP_Up => Dy := -5.0;
when GDK_Down | GDK_KP_Down => Dy := 5.0;
when GDK_Left | GDK_KP_Left => Dx := -5.0;
when GDK_Right | GDK_KP_Right => Dx := 5.0;
when others => return False;
end case;
Cancel_Inline_Editing (Self);
if Event.Item = null then
Box := Self.Get_Visible_Area;
Self.Center_On
((Box.X + Dx, Box.Y + Dy), X_Pos => 0.0, Y_Pos => 0.0);
else
Copy_Selected_To_Dragged_Items
(Self, Force => Event.Toplevel_Item);
Move_Dragged_Items
(Self, Dx => Dx, Dy => Dy, From_Initial => True);
Self.Dragged_Items.Clear;
Self.Queue_Draw;
end if;
return True;
end if;
return False;
end On_Item_Event_Key_Scrolls_Generic;
--------------------------
-- Prepare_Smart_Guides --
--------------------------
procedure Prepare_Smart_Guides
(Self : not null access Canvas_View_Record'Class)
is
Screen : constant Model_Rectangle := Self.Get_Visible_Area;
procedure Add_Guides
(Guides : in out Smart_Guide_Lists.List;
Start, Middle, Last : Model_Coordinate;
Min, Max : Model_Coordinate);
procedure Process_Item
(Item : not null access Abstract_Item_Record'Class);
-- Add smart guides for a specific item
----------------
-- Add_Guides --
----------------
procedure Add_Guides
(Guides : in out Smart_Guide_Lists.List;
Start, Middle, Last : Model_Coordinate;
Min, Max : Model_Coordinate)
is
procedure Update_Guide (Guide : in out Smart_Guide);
procedure Update_Guide (Guide : in out Smart_Guide) is
begin
Guide.Min := Model_Coordinate'Min (Guide.Min, Min);
Guide.Max := Model_Coordinate'Max (Guide.Max, Max);
end Update_Guide;
use Smart_Guide_Lists;
Found_Start, Found_Middle, Found_End : Boolean := False;
C : Smart_Guide_Lists.Cursor := Guides.First;
Pos : Model_Coordinate;
begin
while Has_Element (C) loop
Pos := Element (C).Pos;
if Pos = Start then
Found_Start := True;
Guides.Update_Element (C, Update_Guide'Access);
elsif Pos = Middle then
Found_Middle := True;
Guides.Update_Element (C, Update_Guide'Access);
elsif Pos = Last then
Found_End := True;
Guides.Update_Element (C, Update_Guide'Access);
end if;
Next (C);
end loop;
if not Found_Start then
Guides.Append
((Pos => Start,
Min => Min,
Max => Max,
Visible => False));
end if;
if not Found_Middle then
Guides.Append
((Pos => Middle,
Min => Min,
Max => Max,
Visible => False));
end if;
if not Found_End then
Guides.Append
((Pos => Last,
Min => Min,
Max => Max,
Visible => False));
end if;
end Add_Guides;
------------------
-- Process_Item --
------------------
procedure Process_Item
(Item : not null access Abstract_Item_Record'Class)
is
Box : Model_Rectangle;
begin
-- If this is not one of the items we are dragging
if not Item.Is_Link
and then not Self.Dragged_Items.Contains (Abstract_Item (Item))
then
Box := Item.Model_Bounding_Box;
Add_Guides
(Self.Snap.Hguides,
Start => Box.Y,
Middle => Box.Y + Box.Height / 2.0,
Last => Box.Y + Box.Height,
Min => Box.X,
Max => Box.X + Box.Width);
Add_Guides
(Self.Snap.Vguides,
Start => Box.X,
Middle => Box.X + Box.Width / 2.0,
Last => Box.X + Box.Width,
Min => Box.Y,
Max => Box.Y + Box.Height);
end if;
end Process_Item;
begin
Self.Snap.Hguides.Clear;
Self.Snap.Vguides.Clear;
if Self.Model = null then
return;
end if;
Self.Model.For_Each_Item (Process_Item'Access, In_Area => Screen);
end Prepare_Smart_Guides;
-----------------------
-- Free_Smart_Guides --
-----------------------
procedure Free_Smart_Guides
(Self : not null access Canvas_View_Record'Class) is
begin
Self.Snap.Hguides.Clear;
Self.Snap.Vguides.Clear;
end Free_Smart_Guides;
-------------------------
-- Snap_To_Smart_Guide --
-------------------------
function Snap_To_Smart_Guides
(Self : not null access Canvas_View_Record'Class;
Pos : Model_Coordinate;
Size : Model_Coordinate;
Horizontal : Boolean) return Model_Coordinate
is
use Smart_Guide_Lists;
C : Smart_Guide_Lists.Cursor;
Result : Model_Coordinate := Pos;
procedure Update_Guide (Guide : in out Smart_Guide);
procedure Update_Guide (Guide : in out Smart_Guide) is
begin
if abs (Guide.Pos - Pos) < Self.Snap.Margin then
Guide.Visible := True;
Result := Guide.Pos;
elsif abs (Guide.Pos - Pos - Size / 2.0) < Self.Snap.Margin then
Guide.Visible := True;
Result := Guide.Pos - Size / 2.0;
elsif abs (Guide.Pos - Pos - Size) < Self.Snap.Margin then
Guide.Visible := True;
Result := Guide.Pos - Size;
else
Guide.Visible := False;
end if;
end Update_Guide;
begin
if Horizontal then
C := Self.Snap.Hguides.First;
while Has_Element (C) loop
Self.Snap.Hguides.Update_Element (C, Update_Guide'Access);
Next (C);
end loop;
else
C := Self.Snap.Vguides.First;
while Has_Element (C) loop
Self.Snap.Vguides.Update_Element (C, Update_Guide'Access);
Next (C);
end loop;
end if;
return Result;
end Snap_To_Smart_Guides;
-------------------------------
-- Draw_Visible_Smart_Guides --
-------------------------------
procedure Draw_Visible_Smart_Guides
(Self : not null access Canvas_View_Record'Class;
Context : Draw_Context;
For_Item : not null access Abstract_Item_Record'Class)
is
use Smart_Guide_Lists;
Box : constant Model_Rectangle := For_Item.Model_Bounding_Box;
C : Smart_Guide_Lists.Cursor;
Guide : Smart_Guide;
From, To : Model_Coordinate;
begin
C := Self.Snap.Hguides.First;
while Has_Element (C) loop
Guide := Element (C);
if Guide.Visible then
From := Model_Coordinate'Min (Guide.Min, Box.X);
To := Model_Coordinate'Max (Guide.Max, Box.X + Box.Width);
Self.Snap.Style.Draw_Polyline
(Cr => Context.Cr,
Points => ((From, Guide.Pos), (To, Guide.Pos)));
end if;
Next (C);
end loop;
C := Self.Snap.Vguides.First;
while Has_Element (C) loop
Guide := Element (C);
if Guide.Visible then
From := Model_Coordinate'Min (Guide.Min, Box.Y);
To := Model_Coordinate'Max (Guide.Max, Box.Y + Box.Height);
Self.Snap.Style.Draw_Polyline
(Cr => Context.Cr,
Points => ((Guide.Pos, From), (Guide.Pos, To)));
end if;
Next (C);
end loop;
end Draw_Visible_Smart_Guides;
-------------
-- Gtk_New --
-------------
procedure Gtk_New
(Self : out Minimap_View;
Style : Gtkada.Style.Drawing_Style := Default_Current_Region_Style)
is
begin
Self := new Minimap_View_Record;
Gtkada.Canvas_View.Views.Initialize (Self, Style);
end Gtk_New;
----------------
-- Initialize --
----------------
procedure Initialize
(Self : not null access Minimap_View_Record'Class;
Style : Gtkada.Style.Drawing_Style := Default_Current_Region_Style)
is
begin
Gtkada.Canvas_View.Initialize (Self, Model => null);
Self.Area_Style := Style;
Self.On_Destroy (On_Destroy_Minimap'Access);
Self.On_Item_Event (On_Minimap_Item_Event'Access);
end Initialize;
-------------
-- Monitor --
-------------
procedure Monitor
(Self : not null access Minimap_View_Record;
View : access Canvas_View_Record'Class := null)
is
begin
if Self.Monitored /= null then
Weak_Unref (Self.Monitored, On_Monitored_Destroyed'Access,
Get_Object (Self));
Self.Set_Model (null);
Disconnect (Self.Monitored, Self.Viewport_Changed_Id);
end if;
Self.Monitored := Canvas_View (View);
if View /= null then
Weak_Ref (Self.Monitored, On_Monitored_Destroyed'Access,
Get_Object (Self));
Self.Viewport_Changed_Id := View.On_Viewport_Changed
(On_Monitored_Viewport_Changed'Access, Self);
end if;
Self.Queue_Draw;
end Monitor;
-----------------------------------
-- On_Monitored_Viewport_Changed --
-----------------------------------
procedure On_Monitored_Viewport_Changed
(Minimap : not null access GObject_Record'Class)
is
Self : constant Minimap_View := Minimap_View (Minimap);
begin
Self.Set_Model (Self.Monitored.Model);
Self.Scale_To_Fit (Max_Scale => Gdouble'Last);
end On_Monitored_Viewport_Changed;
------------------------
-- On_Destroy_Minimap --
------------------------
procedure On_Destroy_Minimap (Minimap : access Gtk_Widget_Record'Class) is
begin
Minimap_View (Minimap).Monitor (null);
end On_Destroy_Minimap;
----------------------------
-- On_Monitored_Destroyed --
----------------------------
procedure On_Monitored_Destroyed
(Minimap : System.Address; Monitored : System.Address)
is
pragma Unreferenced (Monitored);
Self : constant Minimap_View :=
Minimap_View (Get_User_Data_Or_Null (Minimap));
begin
Self.Monitored := null;
Self.Queue_Draw;
end On_Monitored_Destroyed;
-------------------
-- Draw_Internal --
-------------------
overriding procedure Draw_Internal
(Self : not null access Minimap_View_Record;
Context : Draw_Context;
Area : Model_Rectangle)
is
Box : Model_Rectangle;
begin
Canvas_View_Record (Self.all).Draw_Internal (Context, Area); -- inherit
if Self.Monitored /= null then
Box := Self.Monitored.Get_Visible_Area;
Self.Area_Style.Draw_Rect
(Context.Cr,
Topleft => (Box.X, Box.Y),
Width => Box.Width,
Height => Box.Height);
end if;
end Draw_Internal;
---------------------------
-- On_Minimap_Item_Event --
---------------------------
function On_Minimap_Item_Event
(View : not null access GObject_Record'Class;
Event : Event_Details_Access)
return Boolean
is
Self : constant Minimap_View := Minimap_View (View);
Screen : Model_Rectangle;
S : Gdouble;
begin
if Self.Monitored /= null then
case Event.Event_Type is
when Button_Press =>
Event.Toplevel_Item := null;
Event.Item := null;
Event.Allowed_Drag_Area := Drag_Anywhere;
Screen := Self.Monitored.Get_Visible_Area;
if Point_In_Rect (Screen, Event.M_Point) then
Self.Drag_Pos_X :=
(Event.M_Point.X - Self.Monitored.Topleft.X)
/ Screen.Width;
Self.Drag_Pos_Y :=
(Event.M_Point.Y - Self.Monitored.Topleft.Y)
/ Screen.Height;
else
Self.Monitored.Center_On (Event.M_Point);
Self.Drag_Pos_X := 0.5;
Self.Drag_Pos_Y := 0.5;
end if;
return True;
when Button_Release =>
Self.Monitored.Center_On (Event.M_Point);
return True;
when In_Drag =>
Self.Monitored.Center_On
(Event.M_Point, Self.Drag_Pos_X, Self.Drag_Pos_Y);
return True;
when Scroll =>
if Event.Button = 5 then
S := Self.Monitored.Get_Scale * 1.1;
else
S := Self.Monitored.Get_Scale / 1.1;
end if;
Self.Monitored.Set_Scale (S, Preserve => Event.M_Point);
return True;
when others =>
null;
end case;
end if;
return False;
end On_Minimap_Item_Event;
--------------------------------
-- Start_Continuous_Scrolling --
--------------------------------
procedure Start_Continuous_Scrolling
(Self : not null access Canvas_View_Record'Class;
Dx, Dy : Model_Coordinate := 0.0)
is
begin
Self.Continuous_Scroll.Dx := Dx;
Self.Continuous_Scroll.Dy := Dy;
if Self.Continuous_Scroll.Id = No_Source_Id then
Self.Continuous_Scroll.Id := View_Sources.Timeout_Add
(Interval => Self.Continuous_Scroll.Timeout,
Func => Do_Continuous_Scroll'Access,
Data => Canvas_View (Self));
end if;
end Start_Continuous_Scrolling;
---------------------------------
-- Cancel_Continuous_Scrolling --
---------------------------------
procedure Cancel_Continuous_Scrolling
(Self : not null access Canvas_View_Record'Class)
is
begin
if Self.Continuous_Scroll.Id /= No_Source_Id then
Remove (Self.Continuous_Scroll.Id);
Self.Continuous_Scroll.Id := No_Source_Id;
end if;
end Cancel_Continuous_Scrolling;
--------------------------
-- Do_Continuous_Scroll --
--------------------------
function Do_Continuous_Scroll (Self : Canvas_View) return Boolean is
begin
Self.Topleft :=
(Self.Topleft.X + Self.Continuous_Scroll.Dx,
Self.Topleft.Y + Self.Continuous_Scroll.Dy);
Move_Dragged_Items
(Self,
Dx => Self.Continuous_Scroll.Dx,
Dy => Self.Continuous_Scroll.Dy,
From_Initial => False);
Self.Viewport_Changed;
Queue_Draw (Self);
return True; -- keep repeating the timeout
end Do_Continuous_Scroll;
------------------------
-- Move_Dragged_Items --
------------------------
procedure Move_Dragged_Items
(Self : not null access Canvas_View_Record'Class;
Dx, Dy : Model_Coordinate;
From_Initial : Boolean)
is
use Item_Drag_Infos;
C : Item_Drag_Infos.Cursor := Self.Dragged_Items.First;
It : Item_Drag_Info;
B : Model_Rectangle;
BB : Item_Rectangle;
X, Y : Model_Coordinate;
Pos : Gtkada.Style.Point;
begin
while Has_Element (C) loop
It := Element (C);
if From_Initial then
X := It.Pos.X + Dx;
Y := It.Pos.Y + Dy;
else
Pos := It.Item.Position;
X := Pos.X + Dx;
Y := Pos.Y + Dy;
end if;
BB := It.Item.Bounding_Box;
-- Constraint the move to a specific area
if Self.Last_Button_Press.Allowed_Drag_Area /= Drag_Anywhere
and then Self.Last_Button_Press.Allowed_Drag_Area /= No_Drag_Allowed
then
B := Self.Last_Button_Press.Allowed_Drag_Area;
X := Model_Coordinate'Max (X, B.X);
X := Model_Coordinate'Min (X, B.X + B.Width - BB.Width);
Y := Model_Coordinate'Max (Y, B.Y);
Y := Model_Coordinate'Min (Y, B.Y + B.Height - BB.Height);
end if;
-- Snap to grid or smart guides
if Self.Last_Button_Press.Allow_Snapping then
if Self.Snap.Grid then
X := Snap_To_Grid (Self, X, BB.Width);
Y := Snap_To_Grid (Self, Y, BB.Height);
end if;
if Self.Snap.Smart_Guides then
X := Snap_To_Smart_Guides (Self, X, BB.Width, False);
Y := Snap_To_Smart_Guides (Self, Y, BB.Height, True);
end if;
end if;
It.Item.Set_Position ((X => X, Y => Y));
Next (C);
end loop;
Refresh_Link_Layout (Self.Model, Self.Dragged_Items);
end Move_Dragged_Items;
-------------------
-- Easing_Linear --
-------------------
function Easing_Linear
(Value : Animation_Value; Progress : Animation_Progress) return Gdouble
is
begin
return Value.Start + (Value.Finish - Value.Start) * Gdouble (Progress);
end Easing_Linear;
-------------------------
-- Easing_In_Out_Cubic --
-------------------------
function Easing_In_Out_Cubic
(Value : Animation_Value; Progress : Animation_Progress) return Gdouble
is
P : Gdouble := 2.0 * Gdouble (Progress);
begin
if Progress < 0.5 then
return (Value.Finish - Value.Start) / 2.0 * P * P * P + Value.Start;
else
P := P - 2.0;
return (Value.Finish - Value.Start) / 2.0 * (P * P * P + 2.0)
+ Value.Start;
end if;
end Easing_In_Out_Cubic;
---------------------
-- Easing_In_Cubic --
---------------------
function Easing_In_Cubic
(Value : Animation_Value; Progress : Animation_Progress) return Gdouble
is
P : constant Gdouble := Gdouble (Progress);
begin
return (Value.Finish - Value.Start) * P * P * P + Value.Start;
end Easing_In_Cubic;
----------------------
-- Easing_Out_Cubic --
----------------------
function Easing_Out_Cubic
(Value : Animation_Value; Progress : Animation_Progress) return Gdouble
is
P : constant Gdouble := Gdouble (Progress) - 1.0;
begin
return (Value.Finish - Value.Start) * (P * P * P + 1.0) + Value.Start;
end Easing_Out_Cubic;
------------------------
-- Easing_Out_Elastic --
------------------------
function Easing_Out_Elastic
(Value : Animation_Value; Progress : Animation_Progress) return Gdouble
is
P : Gdouble;
begin
if Progress <= 0.0 then
return Value.Start;
end if;
if Progress >= 1.0 then
return Value.Finish;
end if;
P := Gdouble (Value.Duration) * 0.3;
return (Value.Finish - Value.Start)
* (2.0 ** (-10.0 * Gdouble (Progress)))
* Sin
((Gdouble (Progress) * Gdouble (Value.Duration) - P / 4.0)
* (2.0 * Pi / P))
+ Value.Finish;
end Easing_Out_Elastic;
-----------------------
-- Easing_Out_Bounce --
-----------------------
function Easing_Out_Bounce
(Value : Animation_Value; Progress : Animation_Progress) return Gdouble
is
Magic : constant Gdouble := 7.5625;
First_Bounce : constant Gdouble := 1.0 / 2.75;
Second_Bounce : constant Gdouble := 2.0 / 2.75;
Third_Bounce : constant Gdouble := 2.5 / 2.75;
P : Gdouble := Gdouble (Progress);
C : constant Gdouble := Value.Finish - Value.Start;
begin
if P < First_Bounce then
return C * Magic * P * P + Value.Start;
elsif P < Second_Bounce then
P := P - (1.5 / 2.75);
return C * (Magic * P * P + 0.75) + Value.Start;
elsif P < Third_Bounce then
P := P - (2.25 / 2.75);
return C * (Magic * P * P + 0.9375) + Value.Start;
else
P := P - (2.625 / 2.75);
return C * (Magic * P * P + 0.984375) + Value.Start;
end if;
end Easing_Out_Bounce;
-----------
-- Setup --
-----------
procedure Setup
(Self : in out Animator;
Duration : Standard.Duration;
Easing : not null Easing_Function := Easing_In_Out_Cubic'Access;
View : access Canvas_View_Record'Class := null;
Item : access Abstract_Item_Record'Class := null)
is
begin
Self.Easing := Easing;
Self.Duration := Duration;
Self.View := View;
Self.Item := Item;
end Setup;
----------------------
-- Animate_Position --
----------------------
function Animate_Position
(Item : not null access Abstract_Item_Record'Class;
Final_Position : Gtkada.Style.Point;
Duration : Standard.Duration := 0.4;
Easing : Easing_Function := Easing_In_Out_Cubic'Access)
return Animator_Access
is
Pos : constant Gtkada.Style.Point := Item.Position;
begin
if Pos = Final_Position then
return null;
end if;
return new Position_Animator'
(Easing => Easing,
Duration => Duration,
Item => Item,
Pos_X => (Start => Pos.X,
Finish => Final_Position.X,
Duration => Duration),
Pos_Y => (Start => Pos.Y,
Finish => Final_Position.Y,
Duration => Duration),
others => <>);
end Animate_Position;
-------------
-- Execute --
-------------
overriding function Execute
(Self : not null access Position_Animator;
Progress : Animation_Progress)
return Animation_Status is
begin
Self.Item.Set_Position
((X => Self.Easing (Self.Pos_X, Progress),
Y => Self.Easing (Self.Pos_Y, Progress)));
return Needs_Refresh_Links_From_Item;
end Execute;
-------------------
-- Animate_Scale --
-------------------
function Animate_Scale
(View : not null access Canvas_View_Record'Class;
Final_Scale : Gdouble;
Preserve : Model_Point := No_Point;
Duration : Standard.Duration := 0.4;
Easing : Easing_Function := Easing_In_Out_Cubic'Access)
return Animator_Access
is
begin
if View.Scale = Final_Scale then
return null;
end if;
return new Scale_Animator'
(Easing => Easing,
Duration => Duration,
View => View,
Preserve => Preserve,
Scale => (Start => View.Scale,
Finish => Final_Scale,
Duration => Duration),
others => <>);
end Animate_Scale;
-------------
-- Execute --
-------------
overriding function Execute
(Self : not null access Scale_Animator;
Progress : Animation_Progress) return Animation_Status is
begin
Self.View.Set_Scale
(Scale => Self.Easing (Self.Scale, Progress),
Preserve => Self.Preserve);
return 0;
end Execute;
--------------------
-- Animate_Scroll --
--------------------
function Animate_Scroll
(View : not null access Canvas_View_Record'Class;
Final_Topleft : Model_Point;
Duration : Standard.Duration := 0.8;
Easing : Easing_Function := Easing_In_Out_Cubic'Access)
return Animator_Access
is
begin
if View.Topleft = Final_Topleft then
return null;
end if;
return new Scroll_Animator'
(Easing => Easing,
Duration => Duration,
View => View,
Topleft_X => (Start => View.Topleft.X,
Finish => Final_Topleft.X,
Duration => Duration),
Topleft_Y => (Start => View.Topleft.Y,
Finish => Final_Topleft.Y,
Duration => Duration),
others => <>);
end Animate_Scroll;
-------------
-- Execute --
-------------
overriding function Execute
(Self : not null access Scroll_Animator;
Progress : Animation_Progress) return Animation_Status
is
begin
Self.View.Topleft :=
(X => Self.Easing (Self.Topleft_X, Progress),
Y => Self.Easing (Self.Topleft_Y, Progress));
Self.View.Set_Adjustment_Values;
return 0;
end Execute;
------------------------
-- On_Animate_Destroy --
------------------------
procedure On_Animate_Destroy (View : in out Canvas_View) is
procedure Unchecked_Free is new Ada.Unchecked_Deallocation
(Base_Animation_Data'Class, Base_Animation_Data_Access);
begin
View.Id_Animation := No_Source_Id;
Unchecked_Free (View.Animation_Data);
end On_Animate_Destroy;
-----------
-- Start --
-----------
procedure Start
(Self : access Animator'Class;
View : not null access Canvas_View_Record'Class)
is
Data : Animation_Data_Access;
C : Animator_Lists.Cursor;
begin
if Self = null then
return;
end if;
if View.Animation_Data = null then
View.Animation_Data := new Animation_Data;
end if;
if View.Id_Animation = No_Source_Id then
-- Use an idle rather than a timeout: a timeout would execute after
-- n milliseconds, then after (n + execution time for On_Animate)
-- milliseconds, and so on, so the quality of the animation degrades.
View.Id_Animation := View_Sources.Idle_Add
(On_Animate'Access,
Canvas_View (View),
Notify => On_Animate_Destroy'Access);
end if;
Data := Animation_Data_Access (View.Animation_Data);
-- Do we need to remove any of the previous animators ?
if Self.Is_Unique_For_Item then
C := Data.Queue.First;
while Has_Element (C) loop
if Element (C)'Tag = Self'Tag
and then Element (C).Item = Self.Item
and then Element (C).View = Self.View
then
if Data.Current = C then
Next (Data.Current);
end if;
-- No need to search for others, it is unique.
Data.Queue.Delete (C);
exit;
end if;
Next (C);
end loop;
end if;
Data.Queue.Append (Animator_Access (Self));
end Start;
-------------------------
-- Animation_Iteration --
-------------------------
procedure Animation_Iteration
(Self : not null access Canvas_View_Record'Class;
Current : Ada.Calendar.Time;
Max_Time : Duration)
is
Data : constant Animation_Data_Access := Animation_Data_Access
(Self.Animation_Data);
Previous : Animator_Lists.Cursor;
Anim : Animator_Access;
Status : Animation_Status := 0;
Local_Status : Animation_Status;
Progress : Duration;
Items : Item_Drag_Infos.Map;
Max_Count : constant Integer := Integer (Data.Queue.Length);
Count : Natural := 0;
-- These two variables re used to make sure we animate each item only
-- once per iteration.
begin
if not Has_Element (Data.Current) then
Data.Current := Data.Queue.First;
end if;
while Count < Max_Count
and then Has_Element (Data.Current)
and then (Current = No_Time or else Clock - Current < Max_Time)
loop
Anim := Element (Data.Current);
-- Move to the next element, in case the current animator is removed
Previous := Data.Current;
Next (Data.Current);
if not Has_Element (Data.Current) then
Data.Current := Data.Queue.First;
end if;
-- Initialize first time animators;
if Anim.Start = No_Time then
Anim.Start := Current;
end if;
-- Perform the animation
if Current = No_Time then
Progress := 1.0;
else
Progress := (Current - Anim.Start) / Anim.Duration;
if Progress > 1.0 then
Progress := 1.0;
end if;
end if;
Local_Status := Anim.Execute (Animation_Progress (Progress));
Status := Local_Status or Status;
if Local_Status = Needs_Refresh_Links_From_Item
and then (Status and Needs_Refresh_All_Links) = 0
and then (Status and Needs_Refresh_Layout) = 0
then
Items.Include
(Abstract_Item (Anim.Item),
Item_Drag_Info'(Item => Abstract_Item (Anim.Item), Pos => <>));
end if;
-- Destroy terminated animators
if Progress >= 1.0 then
Anim.Destroy;
Data.Queue.Delete (Previous);
if Data.Queue.Is_Empty then
Data.Current := No_Element;
end if;
end if;
Count := Count + 1;
end loop;
-- No need to refresh if the canvas is being destroyed
if Current /= No_Time then
if (Status and Needs_Refresh_Layout) /= 0 then
Self.Model.Refresh_Layout;
elsif (Status and Needs_Refresh_All_Links) /= 0 then
Self.Model.Refresh_Link_Layout;
Self.Model.Layout_Changed;
elsif (Status and Needs_Refresh_Links_From_Item) /= 0 then
Self.Model.Refresh_Link_Layout (Items);
Self.Model.Layout_Changed;
end if;
end if;
end Animation_Iteration;
----------------
-- On_Animate --
----------------
function On_Animate (View : Canvas_View) return Boolean is
Now : constant Ada.Calendar.Time := Clock;
Data : constant Animation_Data_Access :=
Animation_Data_Access (View.Animation_Data);
begin
-- No need to do anywork if we are called too often
if Data.Last_Run = No_Time
or else (Now - Data.Last_Run > Min_Animation_Interval)
then
Data.Last_Run := Now;
Animation_Iteration
(View,
Current => Now,
Max_Time => Duration (Animation_Interval) / 1000.0);
end if;
return not Data.Queue.Is_Empty;
end On_Animate;
-------------------------
-- Terminate_Animation --
-------------------------
procedure Terminate_Animation
(Self : not null access Canvas_View_Record'Class) is
begin
if Self.Id_Animation /= No_Source_Id then
Animation_Iteration
(Self,
Current => GNAT.Calendar.No_Time,
Max_Time => Duration'Last);
Remove (Self.Id_Animation);
end if;
end Terminate_Animation;
----------------------------------
-- Terminate_Animation_For_Item --
----------------------------------
procedure Terminate_Animation_For_Item
(Self : not null access Canvas_View_Record'Class;
Item : access Abstract_Item_Record'Class := null)
is
Data : constant Animation_Data_Access :=
Animation_Data_Access (Self.Animation_Data);
C, C2 : Animator_Lists.Cursor;
begin
if Data /= null then
C := Data.Queue.First;
while Has_Element (C) loop
C2 := C;
Next (C);
if (Item /= null and then Element (C2).Item = Item)
or else (Item = null and then Element (C2).View = Self)
then
if Data.Current = C2 then
Next (Data.Current);
end if;
Data.Queue.Delete (C2);
end if;
end loop;
if Data.Queue.Is_Empty then
Remove (Self.Id_Animation);
end if;
end if;
end Terminate_Animation_For_Item;
------------------------
-- Is_Unique_For_Item --
------------------------
function Is_Unique_For_Item
(Self : not null access Animator) return Boolean
is
pragma Unreferenced (Self);
begin
return True;
end Is_Unique_For_Item;
-------------------
-- Reserve_Space --
-------------------
procedure Reserve_Space
(Self : not null access Canvas_View_Record'Class;
Rect : Model_Rectangle;
Direction : Move_Direction := Any;
Do_Not_Move : Item_Sets.Set := Item_Sets.Empty_Set;
Duration : Standard.Duration := 0.0;
Easing : Easing_Function := Easing_In_Out_Cubic'Access)
is
use Item_Sets;
Overlap_Margin : constant Gdouble := 5.0;
-- Minimum distance between items
Moved : Item_Sets.Set := Do_Not_Move;
-- The items that have already been moved. An item is never moved twice.
procedure Process
(Item : not null access Abstract_Item_Record'Class;
Box : Model_Rectangle;
Direction : Move_Direction);
-- Moves item in the given direction so that it no longer overlaps
-- Box.
procedure Move_Items_In_Box
(Box : Model_Rectangle;
Direction : Move_Direction);
-- Move all items in the given area
-------------
-- Process --
-------------
procedure Process
(Item : not null access Abstract_Item_Record'Class;
Box : Model_Rectangle;
Direction : Move_Direction)
is
BBox : constant Model_Rectangle := Item.Model_Bounding_Box;
Pos : Point := (BBox.X, BBox.Y);
D1, D2, D3, D4 : Gdouble;
Dir : Move_Direction := Direction;
begin
if Moved.Contains (Abstract_Item (Item)) then
return;
end if;
case Direction is
when Left =>
Pos.X := Box.X - BBox.Width - Overlap_Margin;
when Right =>
Pos.X := Box.X + Box.Width + Overlap_Margin;
when Up =>
Pos.Y := Box.Y - BBox.Height - Overlap_Margin;
when Down =>
Pos.Y := Box.Y + Box.Height + Overlap_Margin;
when Horizontal =>
D1 := Box.X - BBox.Width - Overlap_Margin - BBox.X;
D2 := Box.X + Box.Width + Overlap_Margin - BBox.X;
if abs (D1) < abs (D2) then
Dir := Left;
Pos.X := D1 + BBox.X;
else
Dir := Right;
Pos.X := D2 + BBox.X;
end if;
when Vertical =>
D3 := Box.Y - BBox.Height - Overlap_Margin - BBox.Y;
D4 := Box.Y + Box.Height + Overlap_Margin - BBox.Y;
if abs (D3) < abs (D4) then
Dir := Up;
Pos.Y := D3 + BBox.Y;
else
Dir := Down;
Pos.Y := D4 + BBox.Y;
end if;
when Any =>
D1 := Box.X - BBox.Width - Overlap_Margin - BBox.X;
D2 := Box.X + Box.Width + Overlap_Margin - BBox.X;
if abs (D1) > abs (D2) then
D1 := D2;
end if;
D3 := Box.Y - BBox.Height - Overlap_Margin - BBox.Y;
D4 := Box.Y + Box.Height + Overlap_Margin - BBox.Y;
if abs (D3) > abs (D4) then
D3 := D4;
end if;
if abs (D1) < abs (D3) then
-- move horizontally
Pos.X := BBox.X + D1;
if D1 = D2 then
Dir := Right;
else
Dir := Left;
end if;
else
Pos.Y := BBox.Y + D3;
if D3 = D4 then
Dir := Down;
else
Dir := Up;
end if;
end if;
end case;
Moved.Include (Abstract_Item (Item));
-- The new box is slightly less than the overlap margin, since
-- otherwise we have the following scenario: move A on top of B.
-- Assume B is moved downward (at a distance Overlap_Margin from A).
-- If we then move C on top of the left-hand side of A, then A is
-- correctly moved to the right, but B is also moved.
Move_Items_In_Box
((Pos.X - (Overlap_Margin - 1.0),
Pos.Y - (Overlap_Margin - 1.0),
BBox.Width + 2.0 * Overlap_Margin - 2.0,
BBox.Height + 2.0 * Overlap_Margin - 2.0),
Direction => Dir);
if Duration = 0.0 then
Item.Set_Position (Pos);
else
Start (Animate_Position (Item, Pos, Duration, Easing), Self);
end if;
end Process;
-----------------------
-- Move_Items_In_Box --
-----------------------
procedure Move_Items_In_Box
(Box : Model_Rectangle;
Direction : Move_Direction)
is
To_Move : Item_Sets.Set;
C : Item_Sets.Cursor;
procedure On_Item (Item : not null access Abstract_Item_Record'Class);
-- Process one of the items that was in the original area
-------------
-- On_Item --
-------------
procedure On_Item
(Item : not null access Abstract_Item_Record'Class) is
begin
-- Store in a temporary structure, since modifying the model might
-- break the iteration with For_Each_Item.
To_Move.Include (Abstract_Item (Item));
end On_Item;
begin
Self.Model.For_Each_Item
(On_Item'Access, Filter => Kind_Item, In_Area => Box);
while not To_Move.Is_Empty loop
C := To_Move.First;
Process (Element (C), Box, Direction => Direction);
To_Move.Delete (C);
end loop;
end Move_Items_In_Box;
begin
Move_Items_In_Box (Rect, Direction);
end Reserve_Space;
-----------------------------
-- Insert_And_Layout_Items --
-----------------------------
procedure Insert_And_Layout_Items
(Self : not null access Canvas_View_Record'Class;
Ref : not null access Abstract_Item_Record'Class;
Items : Items_Lists.List;
Direction : Specific_Direction;
Space_Between_Items : Gdouble := 10.0;
Space_Between_Layers : Gdouble := 20.0;
Duration : Standard.Duration := 0.0)
is
use Items_Lists;
Context : constant Draw_Context := Self.Build_Context;
Horizontal : constant Boolean :=
Direction = Left or else Direction = Right;
C : Items_Lists.Cursor;
Total : Gdouble := 0.0; -- total space for children
Max : Gdouble := 0.0;
Box : Item_Rectangle; -- size of the parent box
CBox : Item_Rectangle; -- size of the current child box
MBox : Model_Rectangle;
Pos : Gtkada.Style.Point;
Child : Gtkada.Style.Point; -- coordinates of first child
Coord : Gtkada.Style.Point; -- coordinates of current child
It : Abstract_Item;
begin
-- Compute the size we need for the children
C := Items.First;
while Has_Element (C) loop
Element (C).Refresh_Layout (Context); -- Compute its size
CBox := Element (C).Bounding_Box;
if Horizontal then
Total := Total + CBox.Height;
Max := Gdouble'Max (Max, CBox.Width);
else
Total := Total + CBox.Width;
Max := Gdouble'Max (Max, CBox.Height);
end if;
Next (C);
end loop;
Total := Total + Space_Between_Items * Gdouble (Items.Length);
-- Now insert (if needed) the parent item, below or to the right of
-- the existing model elements, and centered with regards to its
-- future children
Pos := Ref.Position;
if Pos = No_Position then
Ref.Refresh_Layout (Context); -- Compute its size
Box := Ref.Bounding_Box;
MBox := Self.Model.Bounding_Box;
if Horizontal then
Child.Y := MBox.Y + MBox.Height;
Pos.Y := Child.Y + (Total - MBox.Height) / 2.0;
if Direction = Right then
Pos.X := MBox.X;
Child.X := Pos.X + Box.Width + Space_Between_Layers;
else
Child.X := MBox.X;
Pos.X := Child.X + Max + Space_Between_Layers;
end if;
else
Child.X := MBox.X + MBox.Width;
Pos.X := Child.X + (Total - MBox.Width) / 2.0;
if Direction = Down then
Pos.Y := MBox.Y;
Child.Y := Pos.Y + Box.Height + Space_Between_Layers;
else
Child.Y := MBox.Y;
Pos.Y := Child.Y + Max + Space_Between_Layers;
end if;
end if;
Ref.Set_Position (Pos); -- No animation
else
Box := Ref.Bounding_Box;
if Horizontal then
Child.Y := Pos.Y + (Box.Height - Total) / 2.0;
if Direction = Right then
Child.X := Pos.X + Box.Width + Space_Between_Layers;
else
Child.X := Pos.X - Max - Space_Between_Layers;
end if;
else
Child.X := Pos.X + (Box.Width - Total) / 2.0;
if Direction = Down then
Child.Y := Pos.Y + Box.Height + Space_Between_Layers;
else
Child.Y := Pos.Y - Max - Space_Between_Layers;
end if;
end if;
end if;
-- Reserve space for the children by moving existing items aside.
if Horizontal then
Reserve_Space
(Self,
(Child.X, Child.Y, Max, Total),
Direction => Gtkada.Canvas_View.Views.Horizontal,
Duration => Duration);
else
Reserve_Space
(Self,
(Child.X, Child.Y, Total, Max),
Direction => Gtkada.Canvas_View.Views.Vertical,
Duration => Duration);
end if;
-- Now move the children into place
C := Items.First;
Coord := Child;
while Has_Element (C) loop
It := Abstract_Item (Element (C));
if Duration = 0.0 then
It.Set_Position (Coord);
else
It.Set_Position (Pos); -- position of the parent initially
Start
(Animate_Position (It, Coord, Duration => Duration), Self);
end if;
CBox := It.Bounding_Box;
if Horizontal then
Coord.Y := Coord.Y + CBox.Height + Space_Between_Items;
else
Coord.X := Coord.X + CBox.Width + Space_Between_Items;
end if;
Next (C);
end loop;
Self.Model.Refresh_Layout; -- for links
if Horizontal then
Self.Scroll_Into_View
((Gdouble'Min (Child.X, Pos.X), Gdouble'Min (Child.Y, Pos.Y),
Max + Space_Between_Layers + Box.Width,
Gdouble'Max (Total, Box.Height)),
Duration => Duration);
else
Self.Scroll_Into_View
((Gdouble'Min (Child.X, Pos.X), Gdouble'Min (Child.Y, Pos.Y),
Gdouble'Max (Total, Box.Width),
Max + Space_Between_Layers + Box.Height),
Duration => Duration);
end if;
Self.Queue_Draw;
end Insert_And_Layout_Items;
end Gtkada.Canvas_View.Views;
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