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WindowServer: Add support for alpha channel based hit testing

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This enables implementing non-rectangular window shapes, including
non-rectangular window frames.
This commit is contained in:
Tom 2021-02-14 16:42:37 -07:00 • committed by Andreas Kling
parent b3f0a5c917
commit d590e0c946
12 changed files with 107 additions and 12 deletions
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15
Userland/Libraries/LibGUI/Window.cpp
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@ -147,6 +147,7 @@ void Window::show()
m_frameless,
m_accessory,
m_opacity_when_windowless,
m_alpha_hit_threshold,
m_base_size,
m_size_increment,
m_resize_aspect_ratio,
@ -673,6 +674,20 @@ void Window::set_opacity(float opacity)
WindowServerConnection::the().send_sync<Messages::WindowServer::SetWindowOpacity>(m_window_id, opacity);
}
void Window::set_alpha_hit_threshold(float threshold)
{
if (threshold < 0.0f)
threshold = 0.0f;
else if (threshold > 1.0f)
threshold = 1.0f;
if (m_alpha_hit_threshold == threshold)
return;
m_alpha_hit_threshold = threshold;
if (!is_visible())
return;
WindowServerConnection::the().send_sync<Messages::WindowServer::SetWindowAlphaHitThreshold>(m_window_id, threshold);
}
void Window::set_hovered_widget(Widget* widget)
{
if (widget == m_hovered_widget)

4
Userland/Libraries/LibGUI/Window.h
View file

@ -72,6 +72,9 @@ public:
void set_opacity(float);
float opacity() const { return m_opacity_when_windowless; }
void set_alpha_hit_threshold(float);
float alpha_hit_threshold() const { return m_alpha_hit_threshold; }
WindowType window_type() const { return m_window_type; }
void set_window_type(WindowType);
@ -238,6 +241,7 @@ private:
RefPtr<Gfx::Bitmap> m_custom_cursor;
int m_window_id { 0 };
float m_opacity_when_windowless { 1.0f };
float m_alpha_hit_threshold { 0.0f };
RefPtr<Widget> m_main_widget;
WeakPtr<Widget> m_focused_widget;
WeakPtr<Widget> m_global_cursor_tracking_widget;