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IO, Backends: add io.AddFocusEvent(). Clear pressed keys after loosing input focus (#3532)

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Amend/fix #2445, #2696, #3751, #4377
This commit is contained in:
thedmd
2021-08-02 20:17:26 +02:00
committed by ocornut
parent 86afe966d3
commit 2f40be638f
9 changed files with 93 additions and 11 deletions
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21
imgui.cpp
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@ -1180,6 +1180,22 @@ void ImGuiIO::ClearInputCharacters()
InputQueueCharacters.resize(0);
}
void ImGuiIO::AddFocusEvent(bool focused)
{
if (focused)
return;
// Clear buttons state when focus is lost
// (this is useful so e.g. releasing Alt after focus loss on Alt-Tab doesn't trigger the Alt menu toggle)
memset(KeysDown, 0, sizeof(KeysDown));
for (int n = 0; n < IM_ARRAYSIZE(KeysDownDuration); n++)
KeysDownDuration[n] = KeysDownDurationPrev[n] = -1.0f;
KeyCtrl = KeyShift = KeyAlt = KeySuper = false;
KeyMods = KeyModsPrev = ImGuiKeyModFlags_None;
for (int n = 0; n < IM_ARRAYSIZE(NavInputsDownDuration); n++)
NavInputsDownDuration[n] = NavInputsDownDurationPrev[n] = -1.0f;
}
//-----------------------------------------------------------------------------
// [SECTION] MISC HELPERS/UTILITIES (Geometry functions)
//-----------------------------------------------------------------------------
@ -9694,8 +9710,9 @@ static void ImGui::NavUpdateWindowing()
g.NavWindowingToggleLayer = false;
// Apply layer toggle on release
// FIXME: We lack an explicit IO variable for "is the platform window focused", so compare mouse validity to detect the common case of backend clearing releases all keys on ALT-TAB
if (!io.KeyAlt && g.NavWindowingToggleLayer)
// Important: we don't assume that Alt was previously held in order to handle loss of focus when backend calls io.AddFocusEvent(false)
// Important: as before version <18314 we lacked an explicit IO event for focus gain/loss, we also compare mouse validity to detect old backends clearing mouse pos on focus loss.
if (!(io.KeyMods & ImGuiKeyModFlags_Alt) && (io.KeyModsPrev & ImGuiKeyModFlags_Alt) && g.NavWindowingToggleLayer)
if (g.ActiveId == 0 || g.ActiveIdAllowOverlap)
if (IsMousePosValid(&io.MousePos) == IsMousePosValid(&io.MousePosPrev))
apply_toggle_layer = true;