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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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41
SharedGraphics/Painter.cpp
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@ -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)