wehub-resource-sync
76 lines
2.4 KiB
C#
76 lines
2.4 KiB
C#
using System.Windows.Forms;
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using ImGuiNET;
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using T3.Editor.Gui.UiHelpers;
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// ReSharper disable InconsistentNaming
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namespace T3.Editor.App;
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/// <summary>
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/// Helper class to detect pinch zoom on accumulate scrolling / panning on touchpad devices
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/// </summary>
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internal static class MouseWheelPanning
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{
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public static Vector2 PanDelta;
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internal static float PinchZoomDelta;
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internal static void ProcessFrame(float pixelsPerNotch)
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{
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PanDelta = new System.Numerics.Vector2(_wheelX, _wheelY) * pixelsPerNotch;
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PinchZoomDelta = _zoomNotches;
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_wheelX = 0;
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_wheelY = 0;
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_zoomNotches = 0;
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}
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/// <summary>
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/// Needs to be called from WndProc for WM_MOUSEHWHEEL and WM_MOUSEWHEEL
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/// </summary>
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public static void ProcessMouseWheelInput(Message m, ImGuiIOPtr imgGuiIo)
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{
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var wparam = (long)m.WParam;
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var keyFlags = (int)(wparam & 0xffff);
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var delta = (short)((wparam >> 16) & 0xffff); // can be != 120 on precision devices :contentReference[oaicite:1]{index=1}
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var notches = delta / (float)WHEEL_DELTA;
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// This is very sad: Most windows trackpad drivers "simulate" zooming
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// with pinch gestures by sending "MouseWheel" AND pressing the ctrl-key?! WTF?
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var isMouseCtrlTrackPadPinch = (keyFlags & MK_CONTROL) != 0;
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// Optional: sticky "zoom mode" for a short time to suppress stray pan events
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var now = Environment.TickCount64;
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if (isMouseCtrlTrackPadPinch && UserSettings.Config.UseTouchPadPanning || (now - _lastZoomTick) < 80)
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{
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_zoomNotches += notches;
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_zoomNotches += notches; // use vertical delta as zoom input
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_lastZoomTick = now;
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m.Result = IntPtr.Zero;
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return;
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}
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if (m.Msg == WM_MOUSEWHEEL)
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{
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imgGuiIo.MouseWheel += notches / 2;
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_wheelY += notches;
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}
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else
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{
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imgGuiIo.MouseWheelH += notches / 2;
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_wheelX += notches;
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}
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m.Result = IntPtr.Zero;
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}
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private const int WM_MOUSEWHEEL = 0x020A;
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//private const int WM_MOUSEHWHEEL = 0x020E;
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private const int MK_CONTROL = 0x0008;
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private const int WHEEL_DELTA = 120;
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private static long _lastZoomTick;
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private static float _wheelX;
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private static float _wheelY;
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private static float _zoomNotches;
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} |