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LibGUI: Start adding an automatic widget layout system.

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My needs are really quite simple, so I'm just going to add what I need
as I go along. The first thing I needed was a simple box layout with
widgets being able to say whether they prefer fixed or fill for both
their vertical and horizontal sizes.

I also made a simple GStatusBar so FileManager can show how many bytes
worth of files are in the current directory.
This commit is contained in:
Andreas Kling 2019-02-10 11:07:13 +01:00
parent 2cf1dd5b6f
commit 2def3d8d3f
22 changed files with 411 additions and 29 deletions
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26
LibGUI/GWidget.h
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@ -5,16 +5,32 @@
#include <SharedGraphics/Rect.h>
#include <SharedGraphics/Color.h>
#include <SharedGraphics/Font.h>
#include <AK/Badge.h>
#include <AK/AKString.h>
class GraphicsBitmap;
class GLayout;
class GWindow;
enum class SizePolicy { Fixed, Fill };
enum class Orientation { Horizontal, Vertical };
class GWidget : public GObject {
public:
explicit GWidget(GWidget* parent = nullptr);
virtual ~GWidget() override;
GLayout* layout() { return m_layout.ptr(); }
void set_layout(OwnPtr<GLayout>&&);
SizePolicy horizontal_size_policy() const { return m_horizontal_size_policy; }
SizePolicy vertical_size_policy() const { return m_vertical_size_policy; }
SizePolicy size_policy(Orientation orientation) { return orientation == Orientation::Horizontal ? m_horizontal_size_policy : m_vertical_size_policy; }
void set_size_policy(SizePolicy horizontal_policy, SizePolicy vertical_policy);
Size preferred_size() const { return m_preferred_size; }
void set_preferred_size(const Size&);
virtual void event(GEvent&) override;
virtual void paint_event(GPaintEvent&);
virtual void resize_event(GResizeEvent&);
@ -100,16 +116,26 @@ public:
void set_global_cursor_tracking(bool);
bool global_cursor_tracking() const;
void notify_layout_changed(Badge<GLayout>);
private:
void handle_paint_event(GPaintEvent&);
void handle_resize_event(GResizeEvent&);
void do_layout();
void invalidate_layout();
GWindow* m_window { nullptr };
OwnPtr<GLayout> m_layout;
Rect m_relative_rect;
Color m_background_color { 0xffffff };
Color m_foreground_color { 0x000000 };
RetainPtr<Font> m_font;
SizePolicy m_horizontal_size_policy { SizePolicy::Fill };
SizePolicy m_vertical_size_policy { SizePolicy::Fill };
Size m_preferred_size;
bool m_has_pending_paint_event { false };
bool m_fill_with_background_color { true };
};