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unit Unit1;
{$MODE Delphi}
interface
uses
LCLIntf, LCLType, LMessages, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TOnHintEvent = procedure(Sender: TObject; HintInfo: PHintInfo) of object;
TMyHintControl = class (TCustomControl)
private
FBlueRect, FRedRect, FWhiteRect, FYellowRect: TRect;
FOnHintEvent: TOnHintEvent;
FShowOnlyRed: Boolean;
procedure CMHintShow(var Message: TMessage); message CM_HINTSHOW;
procedure SetOnHintEvent(const Value: TOnHintEvent);
procedure SetShowOnlyRed(const Value: Boolean);
protected
procedure Resize; override;
public
constructor Create(TheOwner: TComponent); override;
procedure Paint; override;
property ShowOnlyRed: Boolean read FShowOnlyRed write SetShowOnlyRed;
property OnHintEvent: TOnHintEvent read FOnHintEvent write SetOnHintEvent;
end;
TMyHintButton = class (TButton)
private
procedure CMHintShow(var Message: TMessage); message CM_HINTSHOW;
protected
public
end;
{ TForm1 }
TForm1 = class(TForm)
Button7: TButton;
Button8: TButton;
CheckBox1: TCheckBox;
ListBox1: TListBox;
ButtonClear: TButton;
GroupBoxNoShowHint: TGroupBox;
ButtonShowHintNoParent1: TButton;
Button1: TButton;
Button2: TButton;
ButtonNoShowHintShowParent: TButton;
GroupBoxShowHint: TGroupBox;
Button3: TButton;
Button4: TButton;
Button5: TButton;
Button6: TButton;
procedure CheckBox1Change(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure ButtonClearClick(Sender: TObject);
private
{ Private declarations }
FMyHintControl,FMyHintControl2 : TMyHintControl;
FMyHintButton: TMyHintButton;
procedure HintEvent(Sender: TObject; HintInfo: PHintInfo);
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.lfm}
{ TMyHintControl }
procedure TMyHintControl.CMHintShow(var Message: TMessage);
begin
with TCMHintShow(Message), HintInfo^ do
begin
if Assigned(FOnHintEvent) then
FOnHintEvent(Self, HintInfo);
Result := 1;
if PtInRect(FRedRect, CursorPos) then
begin
Result := 0;
HintStr := 'Red' + #13#10 + 'aaaaa_bbbbb_ccccc_dddddd_eeeeee';
CursorRect := FRedRect;
end;
if FShowOnlyRed then
Exit;
if PtInRect(FBlueRect, CursorPos) then
begin
Result := 0;
HintStr := 'Blue';
CursorRect := FBlueRect;
end;
if PtInRect(FYellowRect, CursorPos) then
begin
Result := 0;
HintStr := 'Yellow';
CursorRect := FYellowRect;
end;
if PtInRect(FWhiteRect, CursorPos) then
begin
Result := 0;
HintStr := 'White';
CursorRect := FWhiteRect;
end;
end;
end;
constructor TMyHintControl.Create(TheOwner: TComponent);
begin
inherited;
Hint := 'Control Hint';
ShowHint := True;
end;
procedure TMyHintControl.Paint;
begin
with Canvas do
begin
Brush.Color := clRed;
FillRect(FRedRect);
Brush.Color := clWhite;
FillRect(FWhiteRect);
Brush.Color := clBlue;
FillRect(FBlueRect);
Brush.Color := clYellow;
FillRect(FYellowRect);
end;
end;
procedure TMyHintButton.CMHintShow(var Message: TMessage);
begin
TCMHintShow(Message).HintInfo^.HintStr := 'CMHintShow';
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
FMyHintControl := TMyHintControl.Create(Self);
with FMyHintControl do
begin
ShowOnlyRed := True;
OnHintEvent := HintEvent;
Parent := Self;
SetBounds(10, 10, 100, 100);
Visible := True;
end;
FMyHintControl2 := TMyHintControl.Create(Self);
with FMyHintControl2 do
begin
OnHintEvent := HintEvent;
Parent := Self;
SetBounds(120, 10, 100, 100);
Visible := True;
end;
FMyHintButton := TMyHintButton.Create(Self);
FMyHintButton.Parent := GroupBoxShowHint;
FMyHintButton.Left := Button7.Left;
FMyHintButton.Width := Button7.Width;
FMyHintButton.Top := Button7.Top + 36;
FMyHintButton.ParentShowHint := True;
FMyHintButton.ShowHint := True;
FMyHintButton.Caption := 'ShowHint = True Parent = True / Hint = '''' / CMHintShow';
end;
procedure TForm1.CheckBox1Change(Sender: TObject);
begin
if CheckBox1.Checked then
begin
GroupBoxNoShowHint.Hint := '';
GroupBoxShowHint.Hint := '';
end
else
begin
GroupBoxNoShowHint.Hint := 'GroupBox';
GroupBoxShowHint.Hint := 'GroupBox';
end;
end;
procedure TMyHintControl.Resize;
begin
inherited;
FRedRect := Rect(0, 0, Width div 2, Height div 2);
FWhiteRect := Rect(Width div 2, 0, Width, Height div 2);
FBlueRect := Rect(0, Height div 2, Width div 2, Height);
FYellowRect := Rect(Width div 2, Height div 2, Width, Height);
end;
procedure TMyHintControl.SetOnHintEvent(const Value: TOnHintEvent);
begin
FOnHintEvent := Value;
end;
procedure TForm1.HintEvent(Sender: TObject; HintInfo: PHintInfo);
begin
with HintInfo^ do
begin
ListBox1.Items.Add(Format('CursorPoint X: %d Y: %d', [CursorPos.X, CursorPos.Y]));
ListBox1.Items.Add(Format('CursorRect L: %d T: %d R: %d B: %d',
[CursorRect.Left, CursorRect.Top, CursorRect.Right, CursorRect.Bottom]));
end;
end;
procedure TForm1.ButtonClearClick(Sender: TObject);
begin
ListBox1.Clear;
end;
procedure TMyHintControl.SetShowOnlyRed(const Value: Boolean);
begin
FShowOnlyRed := Value;
end;
end.
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