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@@ -761,6 +761,23 @@ void DesktopWindow::fullscreen_on() |
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fullscreen(); |
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} |
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#if !defined(WIN32) && !defined(__APPLE__) |
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Bool eventIsFocusWithSerial(Display *display, XEvent *event, XPointer arg) |
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{ |
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unsigned long serial; |
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serial = *(unsigned long*)arg; |
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if (event->xany.serial != serial) |
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return False; |
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if ((event->type != FocusIn) && (event->type != FocusOut)) |
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return False; |
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return True; |
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} |
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#endif |
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void DesktopWindow::grabKeyboard() |
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{ |
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// Grabbing the keyboard is fairly safe as FLTK reroutes events to the |
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@@ -788,6 +805,11 @@ void DesktopWindow::grabKeyboard() |
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#else |
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int ret; |
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XEvent xev; |
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unsigned long serial; |
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serial = XNextRequest(fl_display); |
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ret = XGrabKeyboard(fl_display, fl_xid(this), True, |
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GrabModeAsync, GrabModeAsync, CurrentTime); |
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if (ret) { |
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@@ -801,6 +823,16 @@ void DesktopWindow::grabKeyboard() |
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} |
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return; |
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} |
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// Xorg 1.20+ generates FocusIn/FocusOut even when there is no actual |
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// change of focus. This causes us to get stuck in an endless loop |
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// grabbing and ungrabbing the keyboard. Avoid this by filtering out |
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// any focus events generated by XGrabKeyboard(). |
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XSync(fl_display, False); |
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while (XCheckIfEvent(fl_display, &xev, &eventIsFocusWithSerial, |
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(XPointer)&serial) == True) { |
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vlog.debug("Ignored synthetic focus event cause by grab change"); |
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} |
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#endif |
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keyboardGrabbed = true; |
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@@ -827,7 +859,19 @@ void DesktopWindow::ungrabKeyboard() |
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if (Fl::grab()) |
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return; |
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XEvent xev; |
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unsigned long serial; |
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serial = XNextRequest(fl_display); |
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XUngrabKeyboard(fl_display, CurrentTime); |
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// See grabKeyboard() |
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XSync(fl_display, False); |
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while (XCheckIfEvent(fl_display, &xev, &eventIsFocusWithSerial, |
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(XPointer)&serial) == True) { |
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vlog.debug("Ignored synthetic focus event cause by grab change"); |
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} |
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#endif |
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} |
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