我在表单上有一个 TSynEdit 控件,我想从 TVirtualStringTree 拖放聚焦节点文本。我希望它的行为方式与在 TSynEdit 控件中拖放突出显示的文本时的行为方式相同:
我查看了 TSynEdit DragOver 事件中的代码,但它使用了几个变量和过程,我们无法在后代类中访问这些变量和过程的私有
我已经检查了所有 TSynEdit 演示,找不到满足我需求的演示。
有人成功地成功完成了这项工作吗?
答案 0 :(得分:2)
AZ01的回答并没有完全符合我的要求,但确实指出了我正确的方向。这是我最终使用的代码:
procedure TfrmTemplateEdit.memTemplateDragDrop(Sender, Source: TObject; X,
Y: Integer);
var
InsertText: String;
ASynEdit: TSynEdit;
OldSelStart, DropIndex: Integer;
LCoord: TBufferCoord;
begin
// Set the Insert Text
InsertText := 'The text to insert';
// Set the SynEdit memo
ASynEdit := TSynEdit(Sender);
// Get the position on the mouse
ASynEdit.GetPositionOfMouse(LCoord);
// Find the index of the mouse position
DropIndex := ASynEdit.RowColToCharIndex(LCoord);
// Delete any selected text
If (ASynEdit.SelAvail) and
(DropIndex >= ASynEdit.SelStart) and
(DropIndex <= ASynEdit.SelEnd) then
begin
// Store the old selection start
OldSelStart := ASynEdit.SelStart;
// Delete the text
ASynEdit.ExecuteCommand(ecDeleteChar, #0, Nil);
// Move the caret
ASynEdit.SelStart := OldSelStart;
end
else
begin
// Position the caret at the mouse location
ASynEdit.CaretXY := LCoord;
end;
// Insert the text into the memo
ASynEdit.ExecuteCommand(ecImeStr, #0, PWideChar(InsertText));
// Set the selection start and end points to selected the dropped text
ASynEdit.SelStart := ASynEdit.SelStart - length(InsertText);
ASynEdit.SelEnd := ASynEdit.SelStart + length(InsertText);
// Set the focus to the SynEdit
ASynEdit.SetFocus;
end;
代码似乎与选择,制表符和撤消功能正常。
答案 1 :(得分:1)
我认为您可以通过为编辑器分配两个事件来实现目标:DragOver / DragDrop。
1 /您在 DragOver事件中测试有效性,您还可以通过调用 GetPositionOfMouse
来移动插入符号Procedure TForm1.EditorDragOver(Sender,Source: TObject;X,Y: Integer; State: TDragState; Var Accept: Boolean);
Var
LCoord: TBufferCoord;
LMemo: TSynMemo;
Begin
LMemo := TSynMemo(Sender);
// In your case you would rather test something with your tree...
Accept := Clipboard.AsText <> '';
// "As you drag over the TSynEdit, the caret should mark the current drop position": OK
If LMemo.GetPositionOfMouse(LCoord) Then
LMemo.CaretXY := LCoord;
End;
2 /您使用 DragDrop事件中的编辑器命令清除选择并插入字符
Procedure TForm1.EditorDragDrop(Sender, Source: TObject; X,Y: Integer);
Var
LMemo: TSynMemo;
Begin
LMemo := TSynMemo(Sender);
// "When the text is dropped, it should replace any text that is currently highlighted." : OK
If LMemo.SelAvail Then
LMemo.ExecuteCommand( ecDeleteChar , #0, Nil );
// Paste, same comment as previously, here it's just an example...
LMemo.ExecuteCommand( ecPaste, #0, Nil );
End;
根据您的具体情况,这需要进行一些调整。