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Using the ImGuiWindowFlags_NoScrollWithMouse flag on a child window forwards the mouse wheel event to the parent window, unless either ImGuiWindowFlags_NoInputs or ImGuiWindowFlags_NoScrollbar are also set. (#1380, #1502)

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This commit is contained in:
omar 2017-12-14 18:42:41 +01:00
parent ac8e708c3e
commit eefea0588a
3 changed files with 20 additions and 7 deletions
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17
imgui.cpp
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@ -213,6 +213,7 @@
Here is a change-log of API breaking changes, if you are using one of the functions listed, expect to have to fix some code.
Also read releases logs https://github.com/ocornut/imgui/releases for more details.
- 2017/12/14 (1.53) - using the ImGuiWindowFlags_NoScrollWithMouse flag on a child window forwards the mouse wheel event to the parent window, unless either ImGuiWindowFlags_NoInputs or ImGuiWindowFlags_NoScrollbar are also set.
- 2017/12/13 (1.53) - renamed GetItemsLineHeightWithSpacing() to GetFrameHeightWithSpacing(). Kept redirection function (will obsolete).
- 2017/12/13 (1.53) - obsoleted IsRootWindowFocused() in favor of using IsWindowFocused(ImGuiFocusedFlags_RootWindow). Kept redirection function (will obsolete).
- obsoleted IsRootWindowOrAnyChildFocused() in favor of using IsWindowFocused(ImGuiFocusedFlags_RootAndChildWindows). Kept redirection function (will obsolete).
@ -2462,12 +2463,20 @@ void ImGui::NewFrame()
window->Size *= scale;
window->SizeFull *= scale;
}
else if (!g.IO.KeyCtrl && !(window->Flags & ImGuiWindowFlags_NoScrollWithMouse))
else if (!g.IO.KeyCtrl)
{
// Mouse wheel Scrolling
float scroll_amount = 5 * window->CalcFontSize();
scroll_amount = (float)(int)ImMin(scroll_amount, (window->ContentsRegionRect.GetHeight() + window->WindowPadding.y * 2.0f) * 0.67f);
SetWindowScrollY(window, window->Scroll.y - g.IO.MouseWheel * scroll_amount);
// If a child window has the ImGuiWindowFlags_NoScrollWithMouse flag, we give a chance to scroll its parent (unless either ImGuiWindowFlags_NoInputs or ImGuiWindowFlags_NoScrollbar are also set).
ImGuiWindow* scroll_window = window;
while ((scroll_window->Flags & ImGuiWindowFlags_ChildWindow) && (scroll_window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(scroll_window->Flags & ImGuiWindowFlags_NoScrollbar) && !(scroll_window->Flags & ImGuiWindowFlags_NoInputs) && scroll_window->ParentWindow)
scroll_window = scroll_window->ParentWindow;
if (!(scroll_window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(scroll_window->Flags & ImGuiWindowFlags_NoInputs))
{
float scroll_amount = 5 * scroll_window->CalcFontSize();
scroll_amount = (float)(int)ImMin(scroll_amount, (scroll_window->ContentsRegionRect.GetHeight() + scroll_window->WindowPadding.y * 2.0f) * 0.67f);
SetWindowScrollY(scroll_window, scroll_window->Scroll.y - g.IO.MouseWheel * scroll_amount);
}
}
}

2
imgui.h
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@ -524,7 +524,7 @@ enum ImGuiWindowFlags_
ImGuiWindowFlags_NoResize = 1 << 1, // Disable user resizing with the lower-right grip
ImGuiWindowFlags_NoMove = 1 << 2, // Disable user moving the window
ImGuiWindowFlags_NoScrollbar = 1 << 3, // Disable scrollbars (window can still scroll with mouse or programatically)
ImGuiWindowFlags_NoScrollWithMouse = 1 << 4, // Disable user vertically scrolling with mouse wheel
ImGuiWindowFlags_NoScrollWithMouse = 1 << 4, // Disable user vertically scrolling with mouse wheel. On child window, mouse wheel will be forwarded to the parent unless NoScrollbar is also set.
ImGuiWindowFlags_NoCollapse = 1 << 5, // Disable user collapsing window by double-clicking on it
ImGuiWindowFlags_AlwaysAutoResize = 1 << 6, // Resize every window to its content every frame
//ImGuiWindowFlags_ShowBorders = 1 << 7, // Show borders around windows and items (OBSOLETE! Use e.g. style.FrameBorderSize=1.0f to enable borders).

8
imgui_demo.cpp
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@ -997,6 +997,9 @@ void ImGui::ShowTestWindow(bool* p_open)
{
if (ImGui::TreeNode("Child regions"))
{
static bool disable_mouse_wheel = false;
ImGui::Checkbox("Disable Mouse Wheel", &disable_mouse_wheel);
ImGui::Text("Without border");
static int line = 50;
bool goto_line = ImGui::Button("Goto");
@ -1004,7 +1007,8 @@ void ImGui::ShowTestWindow(bool* p_open)
ImGui::PushItemWidth(100);
goto_line |= ImGui::InputInt("##Line", &line, 0, 0, ImGuiInputTextFlags_EnterReturnsTrue);
ImGui::PopItemWidth();
ImGui::BeginChild("Sub1", ImVec2(ImGui::GetWindowContentRegionWidth() * 0.5f,300), false, ImGuiWindowFlags_HorizontalScrollbar);
ImGui::BeginChild("Sub1", ImVec2(ImGui::GetWindowContentRegionWidth() * 0.5f,300), false, ImGuiWindowFlags_HorizontalScrollbar | (disable_mouse_wheel ? ImGuiWindowFlags_NoScrollWithMouse : 0));
for (int i = 0; i < 100; i++)
{
ImGui::Text("%04d: scrollable region", i);
@ -1018,7 +1022,7 @@ void ImGui::ShowTestWindow(bool* p_open)
ImGui::SameLine();
ImGui::PushStyleVar(ImGuiStyleVar_ChildRounding, 5.0f);
ImGui::BeginChild("Sub2", ImVec2(0,300), true);
ImGui::BeginChild("Sub2", ImVec2(0,300), true, (disable_mouse_wheel ? ImGuiWindowFlags_NoScrollWithMouse : 0));
ImGui::Text("With border");
ImGui::Columns(2);
for (int i = 0; i < 100; i++)