编辑:VCL 在右拖动方面没有问题,下面的示例程序完美运行。鼠标手势实用程序会导致问题。(也许它钩子和拦截 WM_RBUTTONUP 事件......)
我想检测控件右拖动的结束。
对于左拖动,我可以使用 MouseUp 事件,但右拖动后不会发生。
在下面的测试程序中(在表格右侧放一个备忘录并拖动表格),我想在右拖动后重置鼠标光标。
我怎样才能做到这一点?(WM_RBUTTONUP 没有出现。)
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Memo1: TMemo;
procedure FormMouseDown(Sender: TObject; Button: TMouseButton; Shift:
TShiftState; X, Y: Integer);
procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
procedure FormMouseUp(Sender: TObject; Button: TMouseButton; Shift:
TShiftState; X, Y: Integer);
procedure WMRButtonUp(var Message: TWMRButtonUp); message WM_RBUTTONUP;
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
function ShiftStateToStr(Shift: TShiftState): string;
begin
if ssShift in Shift then
Result := Result + 'S-';
if ssCtrl in Shift then
Result := Result + 'C-';
if ssAlt in Shift then
Result := Result + 'A-';
if ssDouble in Shift then
Result := Result + 'D-';
if ssLeft in Shift then
Result := Result + 'L';
if ssRight in Shift then
Result := Result + 'R';
if ssMiddle in Shift then
Result := Result + 'M';
end;
function MouseButtonToStr(Btn: TMouseButton): string;
begin
if Btn = mbLeft then
Result := 'Left'
else if Btn = mbRight then
Result := 'Right'
else if Btn = mbMiddle then
Result := 'Middle';
end;
procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton; Shift:
TShiftState; X, Y: Integer);
begin
SetCapture(Handle);
Memo1.Lines.Add(Format('Down(Btn=%s, Shift=[%s])', [MouseButtonToStr(Button), ShiftStateToStr(Shift)]));
if Button = mbLeft then
Screen.Cursor := crDrag
else if Button = mbRight then
Screen.Cursor := crSize;
end;
procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y:
Integer);
begin
Memo1.Lines.Add(Format('Move(Shift=[%s])', [ShiftStateToStr(Shift)]));
end;
procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton; Shift:
TShiftState; X, Y: Integer);
begin
ReleaseCapture;
Memo1.Lines.Add(Format('Up(Btn=%s, Shift=[%s])', [MouseButtonToStr(Button), ShiftStateToStr(Shift)]));
Screen.Cursor := crDefault;
end;
procedure TForm1.WMRButtonUp(var Message: TWMRButtonUp);
begin
Memo1.Lines.Add('WMRbuttonUp');
inherited;
end;
end.