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LibGUI: Introduce widget content margins + improve splitters

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A GUI::Widget can now set an optional content margin (4x0 by default.)
Pixels in the content margin will be ignored for hit testing purposes.

Use this to allow frame-like widgets (like GUI::Frame!) to ignore any
mouse events in the frame area, and instead let those go to parent.

This allows GUI::Splitter to react "sooner" to mouse events that were
previously swallowed by the child widgets instead of ending up in the
splitter. The net effect is that 2 more pixels on each side of a
splitter handle are now interactive and usable for splitting! :^)
This commit is contained in:
Andreas Kling 2020-04-24 18:55:29 +02:00
parent 9badcff1ba
commit 42f0b2522b
6 changed files with 57 additions and 17 deletions
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2
Libraries/LibGUI/Frame.h
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@ -37,7 +37,7 @@ public:
virtual ~Frame() override;
int frame_thickness() const { return m_thickness; }
void set_frame_thickness(int thickness) { m_thickness = thickness; }
void set_frame_thickness(int thickness);
Gfx::FrameShadow frame_shadow() const { return m_shadow; }
void set_frame_shadow(Gfx::FrameShadow shadow) { m_shadow = shadow; }