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{
Double Commander Components
-------------------------------------------------------------------------
Extended ComboBox classes
Copyright (C) 2012 Przemyslaw Nagay (cobines@gmail.com)
Copyright (C) 2015-2017 Alexander Koblov (alexx2000@mail.ru)
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
}
unit KASComboBox;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, LResources, Forms, Controls, Graphics, Dialogs, StdCtrls,
LCLVersion;
type
{ TComboBoxWithDelItems }
{en
Combo box that allows removing items with Shift+Delete.
}
TComboBoxWithDelItems = class(TComboBox)
protected
procedure KeyDown(var Key: Word; Shift: TShiftState); override;
end;
{ TComboBoxAutoWidth }
TComboBoxAutoWidth = class(TComboBox)
protected
procedure CalculatePreferredSize(
var PreferredWidth, PreferredHeight: Integer;
WithThemeSpace: Boolean); override;
procedure CalculateSize(MaxWidth: Integer; var NeededWidth: Integer);
{$if lcl_fullversion >= 1070000}
procedure DoAutoAdjustLayout(const AMode: TLayoutAdjustmentPolicy;
const AXProportion, AYProportion: Double); override;
{$endif}
end;
procedure Register;
implementation
uses
LCLType, LCLIntf;
procedure Register;
begin
RegisterComponents('KASComponents',[TComboBoxWithDelItems, TComboBoxAutoWidth]);
end;
{ TComboBoxWithDelItems }
procedure TComboBoxWithDelItems.KeyDown(var Key: Word; Shift: TShiftState);
var
Index: Integer;
begin
if DroppedDown and (Key = VK_DELETE) and (Shift = [ssShift]) then
begin
Index := ItemIndex;
if (Index >= 0) and (Index < Items.Count) then
begin
Items.Delete(Index);
ItemIndex := Index;
Key := 0;
end;
end;
inherited KeyDown(Key, Shift);
end;
{ TComboBoxAutoWidth }
procedure TComboBoxAutoWidth.CalculatePreferredSize(var PreferredWidth,
PreferredHeight: Integer; WithThemeSpace: Boolean);
var
AWidth: Integer;
begin
inherited CalculatePreferredSize(PreferredWidth, PreferredHeight, WithThemeSpace);
if csDesigning in ComponentState then Exit;
if (Parent = nil) or (not Parent.HandleAllocated) then Exit;
AWidth := Constraints.MinMaxWidth(10000);
CalculateSize(AWidth, PreferredWidth);
end;
procedure TComboBoxAutoWidth.CalculateSize(MaxWidth: Integer; var NeededWidth: Integer);
var
DC: HDC;
R: TRect;
I, M: Integer;
Flags: Cardinal;
OldFont: HGDIOBJ;
LabelText: String;
Idx: Integer = -1;
begin
if Items.Count = 0 then
LabelText:= Text
else begin
M := Canvas.TextWidth(Text);
for I := 0 to Items.Count - 1 do
begin
Flags := Canvas.TextWidth(Items[I]);
if Flags > M then
begin
M := Flags;
Idx := I;
end;
end;
if Idx < 0 then
LabelText := Text
else begin
LabelText := Items[Idx];
end;
end;
if LabelText = '' then begin
NeededWidth := 1;
Exit;
end;
DC := GetDC(Parent.Handle);
try
R := Rect(0, 0, MaxWidth, 10000);
OldFont := SelectObject(DC, HGDIOBJ(Font.Reference.Handle));
Flags := DT_CALCRECT or DT_EXPANDTABS;
DrawText(DC, PChar(LabelText), Length(LabelText), R, Flags);
SelectObject(DC, OldFont);
NeededWidth := R.Right - R.Left + GetSystemMetrics(SM_CXVSCROLL) * 2;
finally
ReleaseDC(Parent.Handle, DC);
end;
end;
{$if lcl_fullversion >= 1070000}
procedure TComboBoxAutoWidth.DoAutoAdjustLayout(const AMode: TLayoutAdjustmentPolicy;
const AXProportion, AYProportion: Double);
begin
// Don't auto adjust horizontal layout
inherited DoAutoAdjustLayout(AMode, 1.0, AYProportion);
end;
{$endif}
end.
|
