OnMouseDown/Up events

[shineworld 68]

Hi, all

 

I'm trying to use Python extension from Embarcadero:
https://github.com/Embarcadero/DelphiVCL4Python

 

installed in Python 3.9 (32 bits) with
 

pip install delphivcl

I was able to assign an OnClick event (in a Button):

        # creates jogs buttons
        btnXM = Button(self)
        btnXM.Parent = pgOne
        btnXM.Caption = 'X-'
        btnXM.Left = 8
        btnXM.Top = 10
        btnXP = Button(self)
        btnXP.Parent = pgOne
        btnXP.Caption = 'X+'
        btnXP.Left = btnXM.Left + btnXM.Width + 8
        btnXP.Top = 10

        def ClickEventHandler(Sender):
            pass

        btnXP.OnClick = self.jogClickEvent

        def MouseDownHandler(Sender, State, Button, X, Y):
            pass

        btnXP.OnMouseDown = MouseDownHandler

but when reaches the btnXP.OnMouseDown Python notice this error:

*** Remote Interpreter Reinitialized ***
Traceback (most recent call last):
  File "D:\x\develop\qem\rosetta_cnc_1\python-scripts\pyipctcpjsonvcl-demo.py", line 249, in <module>
    main()
  File "D:\x\develop\qem\rosetta_cnc_1\python-scripts\pyipctcpjsonvcl-demo.py", line 241, in main
    f = MainForm(Application)
  File "D:\x\develop\qem\rosetta_cnc_1\python-scripts\pyipctcpjsonvcl-demo.py", line 67, in __init__
    btnXP.OnMouseDown = MouseDownHandler
AttributeError: Error in setting property OnMouseDown
Error: No Registered EventHandler for events of type "TMouseEvent

Looking at btnXP dir():

print(btnXP.__dir__())

['__bound__', '__dir__', '__owned__', 'Action', 'AfterConstruction', 'Align', 'AlignDisabled', 'AlignWithMargins', 'Anchors', 'Assign', 'BeforeDestruction', 'BeginDrag', 'BeginInvoke', 'BiDiMode', 'BindMethodsToEvents', 'BoundsRect', 'BringToFront', 'Broadcast', 'Brush', 'Cancel', 'CanFocus', 'Caption', 'CheckNonMainThreadUsage', 'ClassInfo', 'ClassName', 'ClassNameIs', 'ClassParent', 'ClassType', 'CleanupInstance', 'Click', 'ClientHeight', 'ClientOrigin', 'ClientRect', 'ClientToParent', 'ClientToScreen', 'ClientWidth', 'CommandLinkHint', 'ComObject', 'ComponentCount', 'ComponentIndex', 'Components', 'ComponentState', 'ComponentStyle', 'Constraints', 'ContainsControl', 'ControlAtPos', 'ControlCount', 'Controls', 'ControlState', 'ControlStyle', 'Create', 'CreateParented', 'CreateParentedControl', 'CurrentPPI', 'Cursor', 'CustomHint', 'Default', 'DefaultHandler', 'DesignInfo', 'Destroy', 'DestroyComponents', 'Destroying', 'DisableAlign', 'DisabledImageIndex', 'DisabledImageName', 'DisabledImages', 'Dispatch', 'DisposeOf', 'Dock', 'DockClientCount', 'DockDrop', 'DockManager', 'DockOrientation', 'DockSite', 'DoubleBuffered', 'DragCursor', 'DragDrop', 'Dragging', 'DragKind', 'DragMode', 'DrawTextBiDiModeFlags', 'DrawTextBiDiModeFlagsReadingOnly', 'DropDownMenu', 'ElevationRequired', 'EnableAlign', 'Enabled', 'EndDrag', 'EndFunctionInvoke', 'EndInvoke', 'Equals', 'ExecuteAction', 'ExplicitHeight', 'ExplicitLeft', 'ExplicitTop', 'ExplicitWidth', 'FieldAddress', 'FindChildControl', 'FindComponent', 'FlipChildren', 'Floating', 'FloatingDockSiteClass', 'Focused', 'Font', 'Free', 'FreeInstance', 'FreeNotification', 'FreeOnRelease', 'GetChildren', 'GetControlsAlignment', 'GetEnumerator', 'GetHashCode', 'GetInterface', 'GetInterfaceEntry', 'GetInterfaceTable', 'GetNamePath', 'GetParentComponent', 'GetStyleName', 'GetSystemMetrics', 'GetTabControlList', 'GetTabOrderList', 'GetTextBuf', 'GetTextLen', 'Handle', 'HandleAllocated', 'HandleNeeded', 'HasParent', 'Height', 'HelpContext', 'HelpKeyword', 'HelpType', 'Hide', 'Hint', 'HostDockSite', 'HotImageIndex', 'HotImageName', 'ImageAlignment', 'ImageIndex', 'ImageMargins', 'ImageName', 'Images', 'InheritsFrom', 'InitiateAction', 'InitInstance', 'InsertComponent', 'InsertControl', 'InstanceSize', 'Invalidate', 'IsCustomStyleActive', 'IsDrawingLocked', 'IsImplementorOf', 'IsLightStyleColor', 'IsRightToLeft', 'Left', 'LockDrawing', 'LRDockWidth', 'ManualDock', 'ManualFloat', 'Margins', 'MethodAddress', 'MethodName', 'ModalResult', 'MouseInClient', 'MouseWheelHandler', 'Name', 'NewInstance', 'Observers', 'OnClick', 'OnContextPopup', 'OnDragDrop', 'OnDragOver', 'OnDropDownClick', 'OnEndDock', 'OnEndDrag', 'OnEnter', 'OnExit', 'OnGesture', 'OnKeyDown', 'OnKeyPress', 'OnKeyUp', 'OnMouseActivate', 'OnMouseDown', 'OnMouseEnter', 'OnMouseLeave', 'OnMouseMove', 'OnMouseUp', 'OnStartDock', 'OnStartDrag', 'Owner', 'Padding', 'PaintTo', 'Parent', 'ParentBiDiMode', 'ParentCustomHint', 'ParentDoubleBuffered', 'ParentFont', 'ParentShowHint', 'ParentToClient', 'ParentWindow', 'Perform', 'PixelsPerInch', 'PopupMenu', 'PreProcessMessage', 'PressedImageIndex', 'PressedImageName', 'QualifiedClassName', 'Realign', 'RedrawDisabled', 'ReferenceInterface', 'Refresh', 'RemoveComponent', 'RemoveControl', 'RemoveFreeNotification', 'Repaint', 'ReplaceDockedControl', 'SafeCallException', 'ScaleBy', 'ScaleFactor', 'ScaleForPPI', 'ScaleRectSize', 'ScaleValue', 'ScreenToClient', 'ScrollBy', 'SelectedImageIndex', 'SelectedImageName', 'SendToBack', 'SetBounds', 'SetDesignVisible', 'SetFocus', 'SetParentComponent', 'SetProps', 'SetSubComponent', 'SetTextBuf', 'Show', 'ShowHint', 'Showing', 'Style', 'StyleElements', 'StyleName', 'StylusHotImageIndex', 'StylusHotImageName', 'TabOrder', 'TabStop', 'Tag', 'TBDockHeight', 'ToList', 'Top', 'ToString', 'ToTuple', 'Touch', 'UndockHeight', 'UndockWidth', 'UnitName', 'UnitScope', 'UnlockDrawing', 'Update', 'UpdateAction', 'UpdateControlState', 'UseDockManager', 'UseRightToLeftAlignment', 'UseRightToLeftReading', 'UseRightToLeftScrollBar', 'VCLComObject', 'Visible', 'VisibleDockClientCount', 'Width', 'WindowProc', 'WordWrap']

OnMouseDown/Up are exposed....

I'm not able to understand what I've missed...

Thank you in advance for suggestions

 

[pyscripter 573]

The TMouseEvent is not handled currently by P4D.

To see which events can be handled search the source code for "RegisterHandler".  You could write some code to handle such events.   Please see WrapDelphiEventHandlerTest under the Tests directory for how to do that and if you want submit a PR to add this to P4D.

 

 

[shineworld 68]

@pyscripter

I will do it surely!
I'm trying initially to use the tools as they are.

In the second phase, I will try to put my hands on it!

Edited December 14, 2021 by shineworld

[hsauro 35]

Any progress made on this? It looks like it's still not possible to handle the Mouse events. 

[pyscripter 573]

If you want this done, you may open an issue with this request at the P4D issue tracker, or even better contribute a Pull Request implementing the events you want.

Edited January 16, 2022 by pyscripter

[shineworld 68]

I'm not used with github fork/push/request of pull but I've open a pull request:
https://github.com/Embarcadero/python4delphi/pull/25

I hope it is the right way to do...