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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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8
examples/sdl_opengl2_example/imgui_impl_sdl.cpp
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@ -24,6 +24,7 @@
// Data
static double g_Time = 0.0f;
static bool g_MousePressed[3] = { false, false, false };
static float g_MouseHorizWheel = 0.0f;
static float g_MouseWheel = 0.0f;
static GLuint g_FontTexture = 0;
@ -134,6 +135,10 @@ bool ImGui_ImplSdlGL2_ProcessEvent(SDL_Event* event)
{
case SDL_MOUSEWHEEL:
{
if (event->wheel.x > 0)
g_MouseHorizWheel = 1;
if (event->wheel.x < 0)
g_MouseHorizWheel = -1;
if (event->wheel.y > 0)
g_MouseWheel = 1;
if (event->wheel.y < 0)
@ -285,8 +290,9 @@ void ImGui_ImplSdlGL2_NewFrame(SDL_Window *window)
io.MouseDown[2] = g_MousePressed[2] || (mouseMask & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0;
g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false;
io.MouseHorizWheel = g_MouseHorizWheel;
io.MouseWheel = g_MouseWheel;
g_MouseWheel = 0.0f;
g_MouseWheel = g_MouseHorizWheel = 0.0f;
// Hide OS mouse cursor if ImGui is drawing it
SDL_ShowCursor(io.MouseDrawCursor ? 0 : 1);