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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
examples/opengl2_example/imgui_impl_glfw.cpp
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@ -31,6 +31,7 @@
static GLFWwindow* g_Window = NULL;
static double g_Time = 0.0f;
static bool g_MouseJustPressed[3] = { false, false, false };
static float g_MouseHorizWheel = 0.0f;
static float g_MouseWheel = 0.0f;
static GLuint g_FontTexture = 0;
@ -136,9 +137,10 @@ void ImGui_ImplGlfwGL2_MouseButtonCallback(GLFWwindow*, int button, int action,
g_MouseJustPressed[button] = true;
}
void ImGui_ImplGlfwGL2_ScrollCallback(GLFWwindow*, double /*xoffset*/, double yoffset)
void ImGui_ImplGlfwGL2_ScrollCallback(GLFWwindow*, double xoffset, double yoffset)
{
g_MouseWheel += (float)yoffset; // Use fractional mouse wheel.
g_MouseHorizWheel += (float)xoffset; // Use fractional mouse wheel.
g_MouseWheel += (float)yoffset;
}
void ImGui_ImplGlfwGL2_KeyCallback(GLFWwindow*, int key, int, int action, int mods)
@ -296,8 +298,9 @@ void ImGui_ImplGlfwGL2_NewFrame()
g_MouseJustPressed[i] = false;
}
io.MouseHorizWheel = g_MouseHorizWheel;
io.MouseWheel = g_MouseWheel;
g_MouseWheel = 0.0f;
g_MouseHorizWheel = g_MouseWheel = 0.0f;
// Hide OS mouse cursor if ImGui is drawing it
glfwSetInputMode(g_Window, GLFW_CURSOR, io.MouseDrawCursor ? GLFW_CURSOR_HIDDEN : GLFW_CURSOR_NORMAL);

9
examples/opengl3_example/imgui_impl_glfw_gl3.cpp
View File

@ -25,6 +25,7 @@
static GLFWwindow* g_Window = NULL;
static double g_Time = 0.0f;
static bool g_MouseJustPressed[3] = { false, false, false };
static float g_MouseHorizWheel = 0.0f;
static float g_MouseWheel = 0.0f;
static GLuint g_FontTexture = 0;
static int g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0;
@ -155,9 +156,10 @@ void ImGui_ImplGlfwGL3_MouseButtonCallback(GLFWwindow*, int button, int action,
g_MouseJustPressed[button] = true;
}
void ImGui_ImplGlfwGL3_ScrollCallback(GLFWwindow*, double /*xoffset*/, double yoffset)
void ImGui_ImplGlfwGL3_ScrollCallback(GLFWwindow*, double xoffset, double yoffset)
{
g_MouseWheel += (float)yoffset; // Use fractional mouse wheel.
g_MouseHorizWheel += (float)xoffset; // Use fractional mouse wheel.
g_MouseWheel += (float)yoffset;
}
void ImGui_ImplGlfwGL3_KeyCallback(GLFWwindow*, int key, int, int action, int mods)
@ -408,8 +410,9 @@ void ImGui_ImplGlfwGL3_NewFrame()
g_MouseJustPressed[i] = false;
}
io.MouseHorizWheel = g_MouseHorizWheel;
io.MouseWheel = g_MouseWheel;
g_MouseWheel = 0.0f;
g_MouseHorizWheel = g_MouseWheel = 0.0f;
// Hide OS mouse cursor if ImGui is drawing it
glfwSetInputMode(g_Window, GLFW_CURSOR, io.MouseDrawCursor ? GLFW_CURSOR_HIDDEN : GLFW_CURSOR_NORMAL);

8
examples/sdl_opengl2_example/imgui_impl_sdl.cpp
View File

@ -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);

8
examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp
View File

@ -19,6 +19,7 @@
// 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;
static int g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0;
@ -154,6 +155,10 @@ bool ImGui_ImplSdlGL3_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)
@ -396,8 +401,9 @@ void ImGui_ImplSdlGL3_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_MouseHorizWheel = g_MouseWheel = 0.0f;
// Hide OS mouse cursor if ImGui is drawing it
SDL_ShowCursor(io.MouseDrawCursor ? 0 : 1);

18
imgui.cpp
View File

@ -628,6 +628,7 @@ static bool IsKeyPressedMap(ImGuiKey key, bool repeat = true);
static ImFont* GetDefaultFont();
static void SetCurrentFont(ImFont* font);
static void SetCurrentWindow(ImGuiWindow* window);
static void SetWindowScrollX(ImGuiWindow* window, float new_scroll_x);
static void SetWindowScrollY(ImGuiWindow* window, float new_scroll_y);
static void SetWindowPos(ImGuiWindow* window, const ImVec2& pos, ImGuiCond cond);
static void SetWindowSize(ImGuiWindow* window, const ImVec2& size, ImGuiCond cond);
@ -2430,6 +2431,16 @@ void ImGui::NewFrame()
}
}
// Horizontal wheel scrolling; for consistency, only allowed if Ctrl is not pressed.
if (g.HoveredWindow && g.IO.MouseHorizWheel != 0.0f && !g.HoveredWindow->Collapsed)
{
ImGuiWindow* window = g.HoveredWindow;
if (!g.IO.KeyCtrl && !(window->Flags & ImGuiWindowFlags_NoScrollWithMouse))
{
SetWindowScrollX(window, window->Scroll.x - g.IO.MouseHorizWheel * 10.f);
}
}
// Pressing TAB activate widget focus
if (g.ActiveId == 0 && g.NavWindow != NULL && g.NavWindow->Active && IsKeyPressedMap(ImGuiKey_Tab, false))
g.NavWindow->FocusIdxTabRequestNext = 0;
@ -5244,6 +5255,13 @@ ImVec2 ImGui::GetWindowPos()
return window->Pos;
}
static void SetWindowScrollX(ImGuiWindow* window, float new_scroll_x)
{
window->DC.CursorMaxPos.x += window->Scroll.x; // SizeContents is generally computed based on CursorMaxPos which is affected by scroll position, so we need to apply our change to it.
window->Scroll.x = new_scroll_x;
window->DC.CursorMaxPos.x -= window->Scroll.x;
}
static void SetWindowScrollY(ImGuiWindow* window, float new_scroll_y)
{
window->DC.CursorMaxPos.y += window->Scroll.y; // SizeContents is generally computed based on CursorMaxPos which is affected by scroll position, so we need to apply our change to it.

1
imgui.h
View File

@ -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