TRichEdit在Scrollbars为ssNone时滚轮滚动内容
分类：Components, Delphi
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7月 162014
在TRichEdit的Scrollbars属性为ssNone时，RichEdit中的内容超出边框大小时，翻动鼠标上下滚轮时，内容是不会自动滚动的。需要写代码实现此功能，主要是在RichEdit1MouseWheelUp和RichEdit1MouseWheelDown中发送消息实现，具体代码如下：
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unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, ComCtrls, StdCtrls; type TForm1 = class(TForm) RichEdit1: TRichEdit; procedure RichEdit1MouseWheelDown(Sender: TObject; Shift: TShiftState; MousePos: TPoint; var Handled: Boolean); procedure RichEdit1MouseWheelUp(Sender: TObject; Shift: TShiftState; MousePos: TPoint; var Handled: Boolean); private { Private declarations } public { Public declarations } end; var Form1: TForm1; implementation {$R *.dfm} procedure TForm1.RichEdit1MouseWheelDown(Sender: TObject; Shift: TShiftState; MousePos: TPoint; var Handled: Boolean); begin SendMessage(RichEdit1.Handle, WM_VSCROLL, SB_LINEDOWN, 0); Handled := True; end; procedure TForm1.RichEdit1MouseWheelUp(Sender: TObject; Shift: TShiftState; MousePos: TPoint; var Handled: Boolean); begin SendMessage(RichEdit1.Handle, WM_VSCROLL, SB_LINEUP, 0); Handled := True; end; end. |
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