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Inputs, IO: record MouseWheelRequestAxisSwap information. Apply in UpdateMouseWheel() before legacy ctrl+wheel.

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ocornut
2023-03-29 17:06:44 +02:00
parent a38e3c222f
commit 84fd0c7ff4
2 changed files with 12 additions and 10 deletions
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19
imgui.cpp
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@ -8436,6 +8436,13 @@ static void ImGui::UpdateMouseInputs()
ImGuiContext& g = *GImGui;
ImGuiIO& io = g.IO;
// Mouse Wheel swapping flag
// As a standard behavior holding SHIFT while using Vertical Mouse Wheel triggers Horizontal scroll instead
// - We avoid doing it on OSX as it the OS input layer handles this already.
// - FIXME: However this means when running on OSX over Emscripten, Shift+WheelY will incur two swapping (1 in OS, 1 here), canceling the feature.
// - FIXME: When we can distinguish e.g. touchpad scroll events from mouse ones, we'll set this accordingly based on input source.
io.MouseWheelRequestAxisSwap = io.KeyShift && !io.ConfigMacOSXBehaviors;
// Round mouse position to avoid spreading non-rounded position (e.g. UpdateManualResize doesn't support them well)
if (IsMousePosValid(&io.MousePos))
io.MousePos = g.MouseLastValidPos = ImFloorSigned(io.MousePos);
@ -8596,15 +8603,9 @@ void ImGui::UpdateMouseWheel()
return;
// Mouse wheel scrolling
// As a standard behavior holding SHIFT while using Vertical Mouse Wheel triggers Horizontal scroll instead
// - We avoid doing it on OSX as it the OS input layer handles this already.
// - However this means when running on OSX over Emcripten, Shift+WheelY will incur two swappings (1 in OS, 1 here), cancelling the feature.
const bool swap_axis = g.IO.KeyShift && !g.IO.ConfigMacOSXBehaviors;
if (swap_axis)
{
wheel.x = wheel.y;
wheel.y = 0.0f;
}
// Read about io.MouseWheelRequestAxisSwap and its issue on Mac+Emscripten in UpdateMouseInputs()
if (g.IO.MouseWheelRequestAxisSwap)
wheel = ImVec2(wheel.y, 0.0f);
// Maintain a rough average of moving magnitude on both axises
// FIXME: should by based on wall clock time rather than frame-counter