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POWinforms: Keyboard shortcuts for Winforms app hosting other applications in its panels
 

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  1. POWinforms: Keyboard shortcuts for Winforms app hosting other applications in its panels
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    <p>I have a Winforms application, which hosts two PDF Viewers (Unmanaged C++) in its panels.</p> <p>I want to have application wide hotkeys for project handling (Open,Save,Close,...) which would work even when users focus is on the hosted PDF Viewer.</p> <p>I managed to achieve that via Winapi and RegisterHotKey, but client doesnt like that those are system wide (e.g. they disable the same MS Word hotkeys)</p> <p>I did try to disable and enable global hotkeys on Form's Activate/Deactivate events, however those events appear even when i dont leave my own app, for example on top-menu entry or on a dialog-box.</p> <p>Are there other solutions for application-wide hotkeys, that would work even if the focus is on the hosted application?</p> <p><strong>SOLUTION:</strong></p> <p>In the main Form, I handle Activated and Deactivate events like this :</p> <pre><code>public void PDFPicker_Activated(object sender, EventArgs e) { var foregroundHwnd = GUI.winapiwrap.GetForegroundWindow(); if (foregroundHwnd==this.Handle || this.OwnedForms.Any(form =&gt; form.Handle==foregroundHwnd)) { if (!this.hotkeys.Any()) { registerHotkeys(); this.Text = "Hotkeys just registered"; } } } public void PDFPicker_Deactivate(object sender, EventArgs e) { var foregroundHwnd = GUI.winapiwrap.GetForegroundWindow(); if (foregroundHwnd == this.Handle || this.OwnedForms.Any(form =&gt; form.Handle == foregroundHwnd)) { } else { unregisterHotkeys(); this.Text = "Hotkeys off"; } } </code></pre> <p>Then in the dialog, which is in the OwnedForms array, i call just this:</p> <pre><code>private void QuestionPostingPanel_Activated(object sender, EventArgs e) { parent.PDFPicker_Activated(sender, e); } private void QuestionPostingPanel_Deactivate(object sender, EventArgs e) { parent.PDFPicker_Deactivate(sender, e); } </code></pre> <p>In case of more such dialogs, I would inherit AbstractDialog : Form, add those 2 event functions and a reference to parent, and then inherit all of them from this AbstractDialog.</p> <p>While registering/unregistering GlobalHotkeys, it was a problem for me when I tried doing that in parallel - global hot keys were bound to a thread.</p>
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    1. USTomas Grosup
    1. USTomas Grosup
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    1. COCan't you check the active application and don't handle key-presses if you're app isnt the active window? Or use some timer polling to check the active window and disable the keyboard shortcuts if you're app isnt the active windows.
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      1. POWinforms: Keyboard shortcuts for Winforms app hosting other applications in its panels
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    2. COThe first one would keep other apps hotkeys disabled ...
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      1. USTomas Grosup
 

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