How to make the TScollBox automatically scroll when DragMode is dmAutomatic?
I have a ScrollBox in which I have a GridPanel in which I have Buttons.
I set DragMode to dmAutomatic for all buttons so I can move the buttons around (drag and drop).
But I have a problem: because the GridPanel is larger than the ScrollBox, the ScrollBox has the vertical scrollbar visible. I want to make the ScrollBar to automatically scroll down so I can drop a bottom from the visible (top) rows into the inaccessible rows at the bottom (this is typical behavior for all Windows programs, right?)
I have simple code that is doing this: In MouseMove I detect when the mouse is getting close to the bottom of the ScrollBox and I adjust ScrollBox.VertScrollBa.Position to scroll down. This works ONLY if I am NOT in "drag and drop" mode (if I am not dragging a button).
If I start a drag and drop operation NO mouse events are fired.
What can I do to receive MouseMove event even if I am in "drag and drop" mode?
A solution would be not to use dmAutomatic and implement my own drag and drop alternative (based on mousedown, mousemove, mouseup). Is these a quicker fix?
delphi mouseevent c++builder onmouseover
asked Nov 22 '18 at 16:02
RigelRigel
9,96414111223
|
show 1 more comment
I have a ScrollBox in which I have a GridPanel in which I have Buttons.
I set DragMode to dmAutomatic for all buttons so I can move the buttons around (drag and drop).
But I have a problem: because the GridPanel is larger than the ScrollBox, the ScrollBox has the vertical scrollbar visible. I want to make the ScrollBar to automatically scroll down so I can drop a bottom from the visible (top) rows into the inaccessible rows at the bottom (this is typical behavior for all Windows programs, right?)
I have simple code that is doing this: In MouseMove I detect when the mouse is getting close to the bottom of the ScrollBox and I adjust ScrollBox.VertScrollBa.Position to scroll down. This works ONLY if I am NOT in "drag and drop" mode (if I am not dragging a button).
If I start a drag and drop operation NO mouse events are fired.
What can I do to receive MouseMove event even if I am in "drag and drop" mode?
A solution would be not to use dmAutomatic and implement my own drag and drop alternative (based on mousedown, mousemove, mouseup). Is these a quicker fix?
delphi mouseevent c++builder onmouseover
asked Nov 22 '18 at 16:02
RigelRigel
9,96414111223
1
If I remember correctly aTDragObjectwill receive and handle the mouse messages during Drag&Drop. But you should then get e.g.DragOverevents instead.
– nil
Nov 22 '18 at 16:14
@nil - I think I get the idea: "move the code from MouseMove to DragOver". I will try it. thanks!
– Rigel
Nov 22 '18 at 16:15
Maybe, if it's true that you receive MouseMove when not dragging and DragOver when dragging.
– nil
Nov 22 '18 at 16:19
@nil - it works. can you post your comment as an answer so I can accept it? 1.5 million thanks.
– Rigel
Nov 22 '18 at 16:25
1
"What can I do to receive MouseMove event even if I am in "drag and drop" mode?" - Nothing... you can't. See documentation for SetCapture on MSDN for explanation. Called from TDragObject.Capture.
– Sertac Akyuz
Nov 22 '18 at 16:39
|
show 1 more comment
I have a ScrollBox in which I have a GridPanel in which I have Buttons.
I set DragMode to dmAutomatic for all buttons so I can move the buttons around (drag and drop).
But I have a problem: because the GridPanel is larger than the ScrollBox, the ScrollBox has the vertical scrollbar visible. I want to make the ScrollBar to automatically scroll down so I can drop a bottom from the visible (top) rows into the inaccessible rows at the bottom (this is typical behavior for all Windows programs, right?)
I have simple code that is doing this: In MouseMove I detect when the mouse is getting close to the bottom of the ScrollBox and I adjust ScrollBox.VertScrollBa.Position to scroll down. This works ONLY if I am NOT in "drag and drop" mode (if I am not dragging a button).
If I start a drag and drop operation NO mouse events are fired.
What can I do to receive MouseMove event even if I am in "drag and drop" mode?
A solution would be not to use dmAutomatic and implement my own drag and drop alternative (based on mousedown, mousemove, mouseup). Is these a quicker fix?
delphi mouseevent c++builder onmouseover
asked Nov 22 '18 at 16:02
RigelRigel
9,96414111223
I have a ScrollBox in which I have a GridPanel in which I have Buttons.
I set DragMode to dmAutomatic for all buttons so I can move the buttons around (drag and drop).
But I have a problem: because the GridPanel is larger than the ScrollBox, the ScrollBox has the vertical scrollbar visible. I want to make the ScrollBar to automatically scroll down so I can drop a bottom from the visible (top) rows into the inaccessible rows at the bottom (this is typical behavior for all Windows programs, right?)
I have simple code that is doing this: In MouseMove I detect when the mouse is getting close to the bottom of the ScrollBox and I adjust ScrollBox.VertScrollBa.Position to scroll down. This works ONLY if I am NOT in "drag and drop" mode (if I am not dragging a button).
If I start a drag and drop operation NO mouse events are fired.
What can I do to receive MouseMove event even if I am in "drag and drop" mode?
A solution would be not to use dmAutomatic and implement my own drag and drop alternative (based on mousedown, mousemove, mouseup). Is these a quicker fix?
delphi mouseevent c++builder onmouseover
delphi mouseevent c++builder onmouseover
asked Nov 22 '18 at 16:02
RigelRigel
9,96414111223
asked Nov 22 '18 at 16:02
RigelRigel
9,96414111223
edited Nov 22 '18 at 16:13
Rigel
asked Nov 22 '18 at 16:02
RigelRigel
9,96414111223
asked Nov 22 '18 at 16:02
RigelRigel
9,96414111223
asked Nov 22 '18 at 16:02
RigelRigel
9,96414111223
9,96414111223
1
If I remember correctly aTDragObjectwill receive and handle the mouse messages during Drag&Drop. But you should then get e.g.DragOverevents instead.
– nil
Nov 22 '18 at 16:14
@nil - I think I get the idea: "move the code from MouseMove to DragOver". I will try it. thanks!
– Rigel
Nov 22 '18 at 16:15
Maybe, if it's true that you receive MouseMove when not dragging and DragOver when dragging.
– nil
Nov 22 '18 at 16:19
@nil - it works. can you post your comment as an answer so I can accept it? 1.5 million thanks.
– Rigel
Nov 22 '18 at 16:25
1
"What can I do to receive MouseMove event even if I am in "drag and drop" mode?" - Nothing... you can't. See documentation for SetCapture on MSDN for explanation. Called from TDragObject.Capture.
– Sertac Akyuz
Nov 22 '18 at 16:39
|
show 1 more comment
1
If I remember correctly aTDragObjectwill receive and handle the mouse messages during Drag&Drop. But you should then get e.g.DragOverevents instead.
– nil
Nov 22 '18 at 16:14
@nil - I think I get the idea: "move the code from MouseMove to DragOver". I will try it. thanks!
– Rigel
Nov 22 '18 at 16:15
Maybe, if it's true that you receive MouseMove when not dragging and DragOver when dragging.
– nil
Nov 22 '18 at 16:19
@nil - it works. can you post your comment as an answer so I can accept it? 1.5 million thanks.
– Rigel
Nov 22 '18 at 16:25
1
"What can I do to receive MouseMove event even if I am in "drag and drop" mode?" - Nothing... you can't. See documentation for SetCapture on MSDN for explanation. Called from TDragObject.Capture.
– Sertac Akyuz
Nov 22 '18 at 16:39
1
1
If I remember correctly a
TDragObject will receive and handle the mouse messages during Drag&Drop. But you should then get e.g. DragOver events instead.– nil
Nov 22 '18 at 16:14
If I remember correctly a
TDragObject will receive and handle the mouse messages during Drag&Drop. But you should then get e.g. DragOver events instead.– nil
Nov 22 '18 at 16:14
@nil - I think I get the idea: "move the code from MouseMove to DragOver". I will try it. thanks!
– Rigel
Nov 22 '18 at 16:15
@nil - I think I get the idea: "move the code from MouseMove to DragOver". I will try it. thanks!
– Rigel
Nov 22 '18 at 16:15
Maybe, if it's true that you receive MouseMove when not dragging and DragOver when dragging.
– nil
Nov 22 '18 at 16:19
Maybe, if it's true that you receive MouseMove when not dragging and DragOver when dragging.
– nil
Nov 22 '18 at 16:19
@nil - it works. can you post your comment as an answer so I can accept it? 1.5 million thanks.
– Rigel
Nov 22 '18 at 16:25
@nil - it works. can you post your comment as an answer so I can accept it? 1.5 million thanks.
– Rigel
Nov 22 '18 at 16:25
1
1
"What can I do to receive MouseMove event even if I am in "drag and drop" mode?" - Nothing... you can't. See documentation for SetCapture on MSDN for explanation. Called from TDragObject.Capture.
– Sertac Akyuz
Nov 22 '18 at 16:39
"What can I do to receive MouseMove event even if I am in "drag and drop" mode?" - Nothing... you can't. See documentation for SetCapture on MSDN for explanation. Called from TDragObject.Capture.
– Sertac Akyuz
Nov 22 '18 at 16:39
|
show 1 more comment
1 Answer
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During drag-and-drop operations the VCL will create a TDragObject to manage said drag-and-drop operation. This TDragObject - or a derived class - will start receiving and handling mouse events as long as dragging lasts. In turn, it will generate drag-and-drop specific events like OnDragOver and OnDragDrop which can be handled by - potential target - controls under current mouse position.
This will allow you to handle OnMouseMove whenever no drag-and-drop is happening. In addition handle OnDragOver in a similar way to catch mouse movements when currently dragging.
answered Nov 22 '18 at 16:44
nilnil
1,1161318
add a comment |
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During drag-and-drop operations the VCL will create a TDragObject to manage said drag-and-drop operation. This TDragObject - or a derived class - will start receiving and handling mouse events as long as dragging lasts. In turn, it will generate drag-and-drop specific events like OnDragOver and OnDragDrop which can be handled by - potential target - controls under current mouse position.
This will allow you to handle OnMouseMove whenever no drag-and-drop is happening. In addition handle OnDragOver in a similar way to catch mouse movements when currently dragging.
answered Nov 22 '18 at 16:44
nilnil
1,1161318
add a comment |
During drag-and-drop operations the VCL will create a TDragObject to manage said drag-and-drop operation. This TDragObject - or a derived class - will start receiving and handling mouse events as long as dragging lasts. In turn, it will generate drag-and-drop specific events like OnDragOver and OnDragDrop which can be handled by - potential target - controls under current mouse position.
This will allow you to handle OnMouseMove whenever no drag-and-drop is happening. In addition handle OnDragOver in a similar way to catch mouse movements when currently dragging.
answered Nov 22 '18 at 16:44
nilnil
1,1161318
add a comment |
During drag-and-drop operations the VCL will create a TDragObject to manage said drag-and-drop operation. This TDragObject - or a derived class - will start receiving and handling mouse events as long as dragging lasts. In turn, it will generate drag-and-drop specific events like OnDragOver and OnDragDrop which can be handled by - potential target - controls under current mouse position.
This will allow you to handle OnMouseMove whenever no drag-and-drop is happening. In addition handle OnDragOver in a similar way to catch mouse movements when currently dragging.
answered Nov 22 '18 at 16:44
nilnil
1,1161318
During drag-and-drop operations the VCL will create a TDragObject to manage said drag-and-drop operation. This TDragObject - or a derived class - will start receiving and handling mouse events as long as dragging lasts. In turn, it will generate drag-and-drop specific events like OnDragOver and OnDragDrop which can be handled by - potential target - controls under current mouse position.
This will allow you to handle OnMouseMove whenever no drag-and-drop is happening. In addition handle OnDragOver in a similar way to catch mouse movements when currently dragging.
answered Nov 22 '18 at 16:44
nilnil
1,1161318
edited Nov 22 '18 at 16:55
answered Nov 22 '18 at 16:44
nilnil
1,1161318
answered Nov 22 '18 at 16:44
nilnil
1,1161318
answered Nov 22 '18 at 16:44
nilnil
1,1161318
1,1161318
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If I remember correctly a
TDragObjectwill receive and handle the mouse messages during Drag&Drop. But you should then get e.g.DragOverevents instead.– nil
Nov 22 '18 at 16:14
@nil - I think I get the idea: "move the code from MouseMove to DragOver". I will try it. thanks!
– Rigel
Nov 22 '18 at 16:15
Maybe, if it's true that you receive MouseMove when not dragging and DragOver when dragging.
– nil
Nov 22 '18 at 16:19
@nil - it works. can you post your comment as an answer so I can accept it? 1.5 million thanks.
– Rigel
Nov 22 '18 at 16:25
1
"What can I do to receive MouseMove event even if I am in "drag and drop" mode?" - Nothing... you can't. See documentation for SetCapture on MSDN for explanation. Called from TDragObject.Capture.
– Sertac Akyuz
Nov 22 '18 at 16:39