[RichViewActions] creating your own action

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Sergey Tkachenko
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[RichViewActions] creating your own action

Post by Sergey Tkachenko » Thu Nov 17, 2011 3:38 pm

This example shows how to create your own RichViewAction basing on TrvActionEvent.

This example shows how to implement a simple action displaying information about the current picture in the document.

1. In Delphi IDE, open the ActionList's editor, choose "New Standard Action..." command. Select "RVE Custom | TrvActionEvent.
2. For this action, assign Name='Image Information', Hint='Image Information|Displays the image type and size'.
3. Assign events - OnUpdate and OnExecute:

Code: Select all

procedure TrvActionsResource.rvActionEvent1Execute(Sender: TObject;
  Editor: TCustomRichViewEdit);
var gr: TGraphic;
    Tag: TRVTag;
    Align: TRVVAlign;
    s: TRVUnicodeString;
    info: String;
  Editor.GetCurrentPictureInfo(s, gr, Align, Tag);
  info := Format('%s %dx%d', [gr.ClassName, gr.Width, gr.Height]);
  Application.MessageBox(PChar(info), 'Image Info', MB_OK or MB_ICONINFORMATION);

procedure TrvActionsResource.rvActionEvent1Update(Sender: TObject;
  Editor: TCustomRichViewEdit);
var CurStyleNo: Integer;
  CurStyleNo := Editor.CurItemStyle;
  (Sender as TrvActionEvent).Enabled := (CurStyleNo=rvsPicture) or
2018-Apr-12: changes for compatibility with TRichView 17.3 (for older versions of TRichView, change the type of s variable to TRVAnsiString)

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