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OnGesture 事件中的 const EventInfo: TGestureEventInfo; 参数主要用于识别手势信息; 前面用过 EventInfo.GestureID, 还有 EventInfo.Location 给出了手势动作的起点坐标, 测试代码: procedure TForm1.FormGesture(Sender: TObject; const EventInfo: TGestureEventInfo; var Handled: Boolean); begin ShowMessage(Format('X:%d; Y:%d', [EventInfo.Location.X, EventInfo.Location.Y])); end; EventInfo 是个结构, 里面还有更多信息; 在没有触摸屏的情况下, 其它有可能都用不上了. OnGesture 事件中还有一个 var 参数 Handled: Boolean; Handled 过来的值是 False, 我们一般可以写上一句 Handled := True; 如果 Handled = False 这个触摸动作将继续向上层控件去寻找相应. 首先应该知道, 现在包括窗体在内的诸多控件都有了 GestureManager 属性和 OnGesture 事件... 譬如我们在 Panel 和其窗体上同时设置了手势, 就可以看到 Handled 参数的作用. 测试代码文件: unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, GestureMgr, ExtCtrls; type TForm1 = class(TForm) GestureManager1: TGestureManager; Panel1: TPanel; procedure FormCreate(Sender: TObject); procedure FormGesture(Sender: TObject; const EventInfo: TGestureEventInfo; var Handled: Boolean); procedure Panel1Gesture(Sender: TObject; const EventInfo: TGestureEventInfo; var Handled: Boolean); end; var Form1: TForm1; implementation {$R *.dfm} procedure TForm1.FormCreate(Sender: TObject); begin Self.Touch.GestureManager := GestureManager1; Panel1.Touch.GestureManager := GestureManager1; end; procedure TForm1.FormGesture(Sender: TObject; const EventInfo: TGestureEventInfo; var Handled: Boolean); begin ShowMessage(Sender.ClassName); end; procedure TForm1.Panel1Gesture(Sender: TObject; const EventInfo: TGestureEventInfo; var Handled: Boolean); begin Handled := True; {可以把这句注释掉再试} ShowMessage(Sender.ClassName); end; end. 窗体文件: object Form1: TForm1 Left = 0 Top = 0 Caption = 'Form1' ClientHeight = 206 ClientWidth = 339 Color = clBtnFace Font.Charset = DEFAULT_CHARSET Font.Color = clWindowText Font.Height = -11 Font.Name = 'Tahoma' Font.Style = [] OldCreateOrder = False OnCreate = FormCreate OnGesture = FormGesture PixelsPerInch = 96 TextHeight = 13 object Panel1: TPanel Left = 128 Top = 16 Width = 185 Height = 121 Caption = 'Panel1' TabOrder = 0 OnGesture = Panel1Gesture end object GestureManager1: TGestureManager Left = 56 Top = 104 end end |
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