Applications: Add "Welcome" application, inspired by Windows 98

Applications/Welcome/TextWidget.cpp

@@ -0,0 +1,115 @@
+#include <AK/String.h>
+#include <AK/StringBuilder.h>
+#include <AK/Vector.h>
+#include <LibGUI/GPainter.h>
+
+#include "TextWidget.h"
+
+TextWidget::TextWidget(GWidget* parent)
+    : GFrame(parent)
+{
+}
+
+TextWidget::TextWidget(const StringView& text, GWidget* parent)
+    : GFrame(parent)
+    , m_text(text)
+{
+}
+
+TextWidget::~TextWidget()
+{
+}
+
+void TextWidget::set_text(const StringView& text)
+{
+    if (text == m_text)
+        return;
+    m_text = move(text);
+    wrap_and_set_height();
+    update();
+}
+
+void TextWidget::paint_event(GPaintEvent& event)
+{
+    GFrame::paint_event(event);
+
+    GPainter painter(*this);
+    painter.add_clip_rect(event.rect());
+
+    int indent = 0;
+    if (frame_thickness() > 0)
+        indent = font().glyph_width('x') / 2;
+
+    for (int i = 0; i < m_lines.size(); i++) {
+        auto& line = m_lines[i];
+
+        auto text_rect = frame_inner_rect();
+        text_rect.move_by(indent, i * m_line_height);
+        if (!line.is_empty())
+            text_rect.set_width(text_rect.width() - indent * 2);
+
+        if (is_enabled()) {
+            painter.draw_text(text_rect, line, m_text_alignment, foreground_color(), TextElision::None);
+        } else {
+            painter.draw_text(text_rect.translated(1, 1), line, font(), text_alignment(), Color::White, TextElision::Right);
+            painter.draw_text(text_rect, line, font(), text_alignment(), Color::from_rgb(0x808080), TextElision::Right);
+        }
+    }
+}
+
+void TextWidget::resize_event(GResizeEvent& event)
+{
+    wrap_and_set_height();
+    GWidget::resize_event(event);
+}
+
+void TextWidget::wrap_and_set_height()
+{
+    Vector<String> words;
+    int start = -1;
+    for (int i = 0; i < m_text.length(); i++) {
+        auto ch = m_text[i];
+
+        if (ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n') {
+            if (start != -1)
+                words.append(m_text.substring(start, i - start));
+            start = -1;
+        } else if (start == -1) {
+            start = i;
+        }
+    }
+    if (start != -1)
+        words.append(m_text.substring(start, m_text.length() - start));
+
+    auto rect = frame_inner_rect();
+    if (frame_thickness() > 0)
+        rect.set_width(rect.width() - font().glyph_width('x'));
+
+    StringBuilder builder;
+    Vector<String> lines;
+    int line_width = 0;
+    for (auto& word : words) {
+        int word_width = font().width(word);
+        if (line_width != 0)
+            word_width += font().glyph_width('x');
+
+        if (line_width + word_width > rect.width()) {
+            lines.append(builder.to_string());
+            line_width = 0;
+        }
+
+        if (line_width != 0)
+            builder.append(' ');
+        builder.append(word);
+        line_width += word_width;
+    }
+    auto last_line = builder.to_string();
+    if (!last_line.is_empty()) {
+        lines.append(last_line);
+    }
+
+    m_lines = lines;
+
+    set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
+    set_preferred_size(0, m_lines.size() * m_line_height + frame_thickness() * 2);
+}