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Horizontal mouse wheel support

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This patch adds support for the horizontal mouse wheel in ImGui. It
affects windows that can be scrolled, as long as the Ctrl key is not
being pressed.

The scrolling speed has been set empirically so that it matches the
scrolling speed on the Firefox browser when the horizontal wheel is
used.

Internally, it adds a MouseHorizWheel to ImGuiIO, which is then used in
NewFrame to scroll the current window.

The SDL/GL2, SDL/GL3, GLFW/GL2 and GLFW/GL3 examples has been modified
to use it.
This commit is contained in:
Emmanuel Benoît
2017-11-27 20:36:23 +01:00
parent 0f955b818d
commit 77a310736d
6 changed files with 45 additions and 8 deletions
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imgui.h
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@ -856,6 +856,7 @@ struct ImGuiIO
ImVec2 MousePos; // Mouse position, in pixels. Set to ImVec2(-FLT_MAX,-FLT_MAX) if mouse is unavailable (on another screen, etc.)
bool MouseDown[5]; // Mouse buttons: left, right, middle + extras. ImGui itself mostly only uses left button (BeginPopupContext** are using right button). Others buttons allows us to track if the mouse is being used by your application + available to user as a convenience via IsMouse** API.
float MouseWheel; // Mouse wheel: 1 unit scrolls about 5 lines text.
float MouseHorizWheel; // Horizontal mouse wheel
bool MouseDrawCursor; // Request ImGui to draw a mouse cursor for you (if you are on a platform without a mouse cursor).
bool KeyCtrl; // Keyboard modifier pressed: Control
bool KeyShift; // Keyboard modifier pressed: Shift