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Painter: Add text elision support (only right-hand side supported.)

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Some window titles didn't fit on the taskbar buttons, so I needed a way
to collapse the remaining part of the text into "..."
This commit is contained in:
Andreas Kling 2019-04-04 15:19:04 +02:00
parent ce7341be87
commit 4533539e8a
5 changed files with 56 additions and 15 deletions
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13
SharedGraphics/Font.cpp
View file

@ -160,15 +160,20 @@ bool Font::write_to_file(const String& path)
int Font::width(const String& string) const
{
if (string.is_empty())
return width(string.characters(), string.length());
}
int Font::width(const char* characters, int length) const
{
if (!length)
return 0;
if (m_fixed_width)
return string.length() * m_glyph_width;
return length * m_glyph_width;
int width = 0;
for (int i = 0; i < string.length(); ++i)
width += glyph_width(string[i]) + 1;
for (int i = 0; i < length; ++i)
width += glyph_width(characters[i]) + 1;
return width - 1;
}

1
SharedGraphics/Font.h
View file

@ -61,6 +61,7 @@ public:
byte max_glyph_width() const { return m_max_glyph_width; }
byte glyph_spacing() const { return m_fixed_width ? 0 : 1; }
int width(const String& string) const;
int width(const char*, int) const;
String name() const { return m_name; }
void set_name(const String& name) { m_name = name; }

41
SharedGraphics/Painter.cpp
View file

@ -4,6 +4,7 @@
#include <SharedGraphics/CharacterBitmap.h>
#include <AK/Assertions.h>
#include <AK/StdLibExtras.h>
#include <AK/StringBuilder.h>
#include <unistd.h>
Painter::Painter(GraphicsBitmap& bitmap)
@ -343,8 +344,34 @@ void Painter::draw_scaled_bitmap(const Rect& a_dst_rect, const GraphicsBitmap& s
draw_bitmap(point, font.glyph_bitmap(ch), color);
}
void Painter::draw_text(const Rect& rect, const char* text, int length, const Font& font, TextAlignment alignment, Color color)
void Painter::draw_text(const Rect& rect, const char* text, int length, const Font& font, TextAlignment alignment, Color color, TextElision elision)
{
String elided_text;
if (elision == TextElision::Right) {
if (font.width(text, length) > rect.width()) {
int glyph_spacing = font.glyph_spacing();
int new_length = 0;
int new_width = font.width("...");
for (int i = 0; i < length; ++i) {
int glyph_width = font.glyph_width(text[i]);
// NOTE: Glyph spacing should not be added after the last glyph on the line,
// but since we are here because the last glyph does not actually fit on the line,
// we don't have to worry about spacing.
int width_with_this_glyph_included = new_width + glyph_width + glyph_spacing;
if (width_with_this_glyph_included > rect.width())
break;
++new_length;
new_width += glyph_width + glyph_spacing;
}
StringBuilder builder;
builder.append(text, new_length);
builder.append("...");
elided_text = builder.to_string();
text = elided_text.characters();
length = elided_text.length();
}
}
Point point;
if (alignment == TextAlignment::TopLeft) {
@ -374,19 +401,19 @@ void Painter::draw_text(const Rect& rect, const char* text, int length, const Fo
}
}
void Painter::draw_text(const Rect& rect, const String& text, TextAlignment alignment, Color color)
void Painter::draw_text(const Rect& rect, const String& text, TextAlignment alignment, Color color, TextElision elision)
{
draw_text(rect, text.characters(), text.length(), alignment, color);
draw_text(rect, text.characters(), text.length(), alignment, color, elision);
}
void Painter::draw_text(const Rect& rect, const String& text, const Font& font, TextAlignment alignment, Color color)
void Painter::draw_text(const Rect& rect, const String& text, const Font& font, TextAlignment alignment, Color color, TextElision elision)
{
draw_text(rect, text.characters(), text.length(), font, alignment, color);
draw_text(rect, text.characters(), text.length(), font, alignment, color, elision);
}
void Painter::draw_text(const Rect& rect, const char* text, int length, TextAlignment alignment, Color color)
void Painter::draw_text(const Rect& rect, const char* text, int length, TextAlignment alignment, Color color, TextElision elision)
{
draw_text(rect, text, length, font(), alignment, color);
draw_text(rect, text, length, font(), alignment, color, elision);
}
void Painter::set_pixel(const Point& p, Color color)

9
SharedGraphics/Painter.h
View file

@ -5,6 +5,7 @@
#include "Rect.h"
#include "Size.h"
#include <SharedGraphics/TextAlignment.h>
#include <SharedGraphics/TextElision.h>
#include <AK/AKString.h>
class CharacterBitmap;
@ -28,10 +29,10 @@ public:
void blit(const Point&, const GraphicsBitmap&, const Rect& src_rect);
void blit_with_opacity(const Point&, const GraphicsBitmap&, const Rect& src_rect, float opacity);
void draw_text(const Rect&, const char* text, int length, const Font&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black);
void draw_text(const Rect&, const char* text, int length, TextAlignment = TextAlignment::TopLeft, Color = Color::Black);
void draw_text(const Rect&, const String&, const Font&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black);
void draw_text(const Rect&, const String&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black);
void draw_text(const Rect&, const char* text, int length, const Font&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None);
void draw_text(const Rect&, const char* text, int length, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None);
void draw_text(const Rect&, const String&, const Font&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None);
void draw_text(const Rect&, const String&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None);
void draw_glyph(const Point&, char, Color);
void draw_glyph(const Point&, char, const Font&, Color);

7
SharedGraphics/TextElision.h Normal file
View file

@ -0,0 +1,7 @@
#pragma once
enum class TextElision {
None,
Right,
};