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Begin working on a graphical TextEditor.

It's gonna be a wrapper around a new GTextEditor widget so I can easily
reuse the functionality anywhere I need it. :^)
This commit is contained in:
Andreas Kling 2019-03-07 00:31:06 +01:00
parent 67ee579113
commit 9158de6c41
9 changed files with 434 additions and 1 deletions

77
LibGUI/GTextEditor.h Normal file
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#pragma once
#include <LibGUI/GWidget.h>
#include <AK/Function.h>
#include <AK/HashMap.h>
class GScrollBar;
class GTextPosition {
public:
GTextPosition() { }
GTextPosition(int line, int column)
: m_line(line)
, m_column(column)
{
}
bool is_valid() const { return m_line >= 0 && m_column >= 0; }
int line() const { return m_line; }
int column() const { return m_column; }
void set_line(int line) { m_line = line; }
void set_column(int column) { m_column = column; }
private:
int m_line { -1 };
int m_column { -1 };
};
class GTextEditor : public GWidget {
public:
explicit GTextEditor(GWidget* parent);
virtual ~GTextEditor() override;
void set_text(const String&);
int content_width() const;
Rect visible_content_rect() const;
void scroll_into_view(const GTextPosition&, Orientation);
int line_count() const { return m_lines.size(); }
int padding() const { return 2; }
private:
virtual void paint_event(GPaintEvent&) override;
virtual void resize_event(GResizeEvent&) override;
virtual void mousedown_event(GMouseEvent&) override;
virtual void keydown_event(GKeyEvent&) override;
virtual bool accepts_focus() const override { return true; }
void update_scrollbar_ranges();
Rect line_content_rect(int item_index) const;
Rect cursor_content_rect() const;
void update_cursor();
GScrollBar* m_vertical_scrollbar { nullptr };
GScrollBar* m_horizontal_scrollbar { nullptr };
class Line {
public:
Line() { }
String text() const { return m_text; }
int length() const { return m_text.length(); }
int width(const Font&) const;
void set_text(const String&);
private:
String m_text;
mutable int m_cached_width { -1 };
};
Vector<Line> m_lines;
GTextPosition m_cursor;
};