Disable the CTRL+ mouse wheel scroll text resize
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Hi All, I want to disable text resize of texts of a rich text box when Ctrl + Mouse Wheel scroll is being proformed. Any idea!! Any clues!! How to fix it. Please suggest... Thanks in advance, Regards, Jay.
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Hi All, I want to disable text resize of texts of a rich text box when Ctrl + Mouse Wheel scroll is being proformed. Any idea!! Any clues!! How to fix it. Please suggest... Thanks in advance, Regards, Jay.
Extend the
RichTextBoxclass and overrideWndProc. If you don't want to allow zooming at all, catch theEM_SETZOOM(0x04e1) and don't callbase.WndProc. If you don't want the mouse to be able to set the zoom factor, then catch theWM_MOUSEWHEEL(0x020a) and use the staticControl.ModiferKeysproperties to easily determine if the Ctrl+MouseWheel is in effect. If it is, again, don't callbase.WndProc. In all other cases, be sure to callbase.WndProcpassing a reference to theMessagestruct otherwise your control will not work at all and may not even be initialized correctly.Microsoft MVP, Visual C# My Articles
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Extend the
RichTextBoxclass and overrideWndProc. If you don't want to allow zooming at all, catch theEM_SETZOOM(0x04e1) and don't callbase.WndProc. If you don't want the mouse to be able to set the zoom factor, then catch theWM_MOUSEWHEEL(0x020a) and use the staticControl.ModiferKeysproperties to easily determine if the Ctrl+MouseWheel is in effect. If it is, again, don't callbase.WndProc. In all other cases, be sure to callbase.WndProcpassing a reference to theMessagestruct otherwise your control will not work at all and may not even be initialized correctly.Microsoft MVP, Visual C# My Articles
Hi Heath, Thanx a lot, I could solve the problem by 1.Extending the RichTextBox class 2. Catching WM_MOUSEWHEEL (0x020a) and checking whether Control.ModiferKeys is Keys.Control 3. not calling base.WndProc in the above case (mentioned in 2). Where as I could not get the result by Catching EM_SETZOOM (0x04e1) and not calling base.WndProc. I am keen to know whether is it possible to solve the problem using EM_SETZOOM ? Please Comment. Thanks and Regards, Jay.
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Hi Heath, Thanx a lot, I could solve the problem by 1.Extending the RichTextBox class 2. Catching WM_MOUSEWHEEL (0x020a) and checking whether Control.ModiferKeys is Keys.Control 3. not calling base.WndProc in the above case (mentioned in 2). Where as I could not get the result by Catching EM_SETZOOM (0x04e1) and not calling base.WndProc. I am keen to know whether is it possible to solve the problem using EM_SETZOOM ? Please Comment. Thanks and Regards, Jay.
RichTextBox.ZoomFactoris also between 0.64 and 64.0 because it simply uses theEM_GETZOOMandEM_SETZOOMmessage which it sends to the underlying window handle, same as practically all the controls in Windows Forms.Microsoft MVP, Visual C# My Articles
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RichTextBox.ZoomFactoris also between 0.64 and 64.0 because it simply uses theEM_GETZOOMandEM_SETZOOMmessage which it sends to the underlying window handle, same as practically all the controls in Windows Forms.Microsoft MVP, Visual C# My Articles
Hi Heath, Thanks for the info. using EM_SETZOOM should give the same result.But it does not work I tried to catch the EM_SETZOOM using the following code Did I go wrong somewhere in implementation?. Please comment.
protected override void WndProc(ref System.Windows.Forms.Message m) { if (m.Msg == 0x04e1) //EM_SETZOOM { //Do not set the Zoom simply return return; } else { base.WndProc(ref m); } }Where as catching WM_MOUSEWHEEL and asserting Control.ModifierKeys == Keys.Control solves the problem. Thanks and Regards, Jay. -
Hi Heath, Thanks for the info. using EM_SETZOOM should give the same result.But it does not work I tried to catch the EM_SETZOOM using the following code Did I go wrong somewhere in implementation?. Please comment.
protected override void WndProc(ref System.Windows.Forms.Message m) { if (m.Msg == 0x04e1) //EM_SETZOOM { //Do not set the Zoom simply return return; } else { base.WndProc(ref m); } }Where as catching WM_MOUSEWHEEL and asserting Control.ModifierKeys == Keys.Control solves the problem. Thanks and Regards, Jay.I've tried a few things to and it's my educated guess that the Rich Edit control (which is encapsulated by the
RichTextBox) doesn't use theEM_SETZOOMwhen using Ctrl + Mouse Wheel and instead handles that internally in much the same way the handler forEM_SETZOOMdoes.Microsoft MVP, Visual C# My Articles
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I've tried a few things to and it's my educated guess that the Rich Edit control (which is encapsulated by the
RichTextBox) doesn't use theEM_SETZOOMwhen using Ctrl + Mouse Wheel and instead handles that internally in much the same way the handler forEM_SETZOOMdoes.Microsoft MVP, Visual C# My Articles
Hi Heath, Thanks a lot for sparing your valuable time to solve the problem. Warm Regards, Jay.