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Window: Mouse wheel scrolling while hovering a child window is automatically forwarded to parent window if ScrollMax is zero on the scrolling axis. Also still case if ImGuiWindowFlags_NoScrollWithMouse is set (not new), but previously the forwarding

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would be disabled if ImGuiWindowFlags_NoScrollbar was set on the child window, which is not the case any more (amend #1502, #1380).
This commit is contained in:
omar
2019-07-02 18:28:53 +02:00
parent e16564e67a
commit 54c49b5fb1
2 changed files with 32 additions and 22 deletions
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49
imgui.cpp
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@@ -3449,12 +3449,12 @@ void ImGui::UpdateMouseWheel()
return;
if (g.IO.MouseWheel == 0.0f && g.IO.MouseWheelH == 0.0f)
return;
ImGuiWindow* window = g.HoveredWindow;
// Zoom / Scale window
// FIXME-OBSOLETE: This is an old feature, it still works but pretty much nobody is using it and may be best redesigned.
if (g.IO.MouseWheel != 0.0f && g.IO.KeyCtrl && g.IO.FontAllowUserScaling && !window->Collapsed)
if (g.IO.MouseWheel != 0.0f && g.IO.KeyCtrl && g.IO.FontAllowUserScaling && !g.HoveredWindow->Collapsed)
{
ImGuiWindow* window = g.HoveredWindow;
const float new_font_scale = ImClamp(window->FontWindowScale + g.IO.MouseWheel * 0.10f, 0.50f, 2.50f);
const float scale = new_font_scale / window->FontWindowScale;
window->FontWindowScale = new_font_scale;
@@ -3469,31 +3469,36 @@ void ImGui::UpdateMouseWheel()
}
// Mouse wheel scrolling
// 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).
while ((window->Flags & ImGuiWindowFlags_ChildWindow) && (window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(window->Flags & ImGuiWindowFlags_NoScrollbar) && !(window->Flags & ImGuiWindowFlags_NoMouseInputs) && window->ParentWindow)
window = window->ParentWindow;
const bool scroll_allowed = !(window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(window->Flags & ImGuiWindowFlags_NoMouseInputs);
if (scroll_allowed && (g.IO.MouseWheel != 0.0f || g.IO.MouseWheelH != 0.0f) && !g.IO.KeyCtrl)
// If a child window has the ImGuiWindowFlags_NoScrollWithMouse flag, we give a chance to scroll its parent
// FIXME: Lock scrolling window while not moving (see #2604)
// Vertical Mouse Wheel scrolling
const float wheel_y = (g.IO.MouseWheel != 0.0f && !g.IO.KeyShift) ? g.IO.MouseWheel : 0.0f;
if (wheel_y != 0.0f && !g.IO.KeyCtrl)
{
ImVec2 max_step = window->InnerRect.GetSize() * 0.67f;
// Vertical Mouse Wheel Scrolling (hold Shift to scroll horizontally)
if (g.IO.MouseWheel != 0.0f && !g.IO.KeyShift)
ImGuiWindow* window = g.HoveredWindow;
while ((window->Flags & ImGuiWindowFlags_ChildWindow) && ((window->ScrollMax.y == 0.0f) || ((window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(window->Flags & ImGuiWindowFlags_NoMouseInputs))))
window = window->ParentWindow;
if (!(window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(window->Flags & ImGuiWindowFlags_NoMouseInputs))
{
float scroll_step = ImFloor(ImMin(5 * window->CalcFontSize(), max_step.y));
SetWindowScrollY(window, window->Scroll.y - g.IO.MouseWheel * scroll_step);
}
else if (g.IO.MouseWheel != 0.0f && g.IO.KeyShift)
{
float scroll_step = ImFloor(ImMin(2 * window->CalcFontSize(), max_step.x));
SetWindowScrollX(window, window->Scroll.x - g.IO.MouseWheel * scroll_step);
float max_step = window->InnerRect.GetHeight() * 0.67f;
float scroll_step = ImFloor(ImMin(5 * window->CalcFontSize(), max_step));
SetWindowScrollY(window, window->Scroll.y - wheel_y * scroll_step);
}
}
// Horizontal Mouse Wheel Scrolling (for hardware that supports it)
if (g.IO.MouseWheelH != 0.0f && !g.IO.KeyShift)
// Horizontal Mouse Wheel scrolling, or Vertical Mouse Wheel w/ Shift held
const float wheel_x = (g.IO.MouseWheelH != 0.0f && !g.IO.KeyShift) ? g.IO.MouseWheelH : (g.IO.MouseWheel != 0.0f && g.IO.KeyShift) ? g.IO.MouseWheel : 0.0f;
if (wheel_x != 0.0f && !g.IO.KeyCtrl)
{
ImGuiWindow* window = g.HoveredWindow;
while ((window->Flags & ImGuiWindowFlags_ChildWindow) && ((window->ScrollMax.x == 0.0f) || ((window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(window->Flags & ImGuiWindowFlags_NoMouseInputs))))
window = window->ParentWindow;
if (!(window->Flags & ImGuiWindowFlags_NoScrollWithMouse) && !(window->Flags & ImGuiWindowFlags_NoMouseInputs))
{
float scroll_step = ImFloor(ImMin(2 * window->CalcFontSize(), max_step.x));
SetWindowScrollX(window, window->Scroll.x - g.IO.MouseWheelH * scroll_step);
float max_step = window->InnerRect.GetWidth() * 0.67f;
float scroll_step = ImFloor(ImMin(2 * window->CalcFontSize(), max_step));
SetWindowScrollX(window, window->Scroll.x - wheel_x * scroll_step);
}
}
}