Move Widget & friends into LibGUI.

LibGUI/TextBox.cpp

@@ -0,0 +1,139 @@
+#include "TextBox.h"
+#include <AK/StdLibExtras.h>
+#include <SharedGraphics/CharacterBitmap.h>
+#include <SharedGraphics/Font.h>
+#include <SharedGraphics/Painter.h>
+
+TextBox::TextBox(Widget* parent)
+    : Widget(parent)
+{
+    startTimer(500);
+}
+
+TextBox::~TextBox()
+{
+}
+
+void TextBox::setText(String&& text)
+{
+    m_text = move(text);
+    m_cursorPosition = m_text.length();
+    update();
+}
+
+void TextBox::paintEvent(PaintEvent&)
+{
+    Painter painter(*this);
+
+    // FIXME: Reduce overdraw.
+    painter.fill_rect(rect(), backgroundColor());
+    painter.draw_rect(rect(), foregroundColor());
+
+    if (isFocused())
+        painter.draw_focus_rect(rect());
+
+    Rect innerRect = rect();
+    innerRect.shrink(6, 6);
+
+    size_t maxCharsToPaint = innerRect.width() / font().glyph_width();
+
+    int firstVisibleChar = max((int)m_cursorPosition - (int)maxCharsToPaint, 0);
+    size_t charsToPaint = min(m_text.length() - firstVisibleChar, maxCharsToPaint);
+
+    int y = innerRect.center().y() - font().glyph_height() / 2;
+    for (size_t i = 0; i < charsToPaint; ++i) {
+        char ch = m_text[firstVisibleChar + i];
+        if (ch == ' ')
+            continue;
+        int x = innerRect.x() + (i * font().glyph_width());
+        auto* bitmap = font().glyph_bitmap(ch);
+        if (!bitmap) {
+            dbgprintf("TextBox: glyph missing: %02x\n", ch);
+            ASSERT_NOT_REACHED();
+        }
+        painter.draw_bitmap({x, y}, *bitmap, Color::Black);
+    }
+
+    if (isFocused() && m_cursorBlinkState) {
+        unsigned visibleCursorPosition = m_cursorPosition - firstVisibleChar;
+        Rect cursorRect(innerRect.x() + visibleCursorPosition * font().glyph_width(), innerRect.y(), 1, innerRect.height());
+        painter.fill_rect(cursorRect, foregroundColor());
+    }
+}
+
+void TextBox::mouseDownEvent(MouseEvent&)
+{
+}
+
+void TextBox::handleBackspace()
+{
+    if (m_cursorPosition == 0)
+        return;
+
+    if (m_text.length() == 1) {
+        m_text = String::empty();
+        m_cursorPosition = 0;
+        update();
+        return;
+    }
+
+    char* buffer;
+    auto newText = StringImpl::create_uninitialized(m_text.length() - 1, buffer);
+
+    memcpy(buffer, m_text.characters(), m_cursorPosition - 1);
+    memcpy(buffer + m_cursorPosition - 1, m_text.characters() + m_cursorPosition, m_text.length() - (m_cursorPosition - 1));
+
+    m_text = move(newText);
+    --m_cursorPosition;
+    update();
+}
+
+void TextBox::keyDownEvent(KeyEvent& event)
+{
+    switch (event.key()) {
+    case KeyboardKey::LeftArrow:
+        if (m_cursorPosition)
+            --m_cursorPosition;
+        m_cursorBlinkState = true;
+        update();
+        return;
+    case KeyboardKey::RightArrow:
+        if (m_cursorPosition < m_text.length())
+            ++m_cursorPosition;
+        m_cursorBlinkState = true;
+        update();
+        return;
+    case KeyboardKey::Backspace:
+        return handleBackspace();
+    case KeyboardKey::Return:
+        if (onReturnPressed)
+            onReturnPressed(*this);
+        return;
+    }
+
+    if (!event.text().is_empty()) {
+        ASSERT(event.text().length() == 1);
+
+        char* buffer;
+        auto newText = StringImpl::create_uninitialized(m_text.length() + 1, buffer);
+
+        memcpy(buffer, m_text.characters(), m_cursorPosition);
+        buffer[m_cursorPosition] = event.text()[0];
+        memcpy(buffer + m_cursorPosition + 1, m_text.characters() + m_cursorPosition, m_text.length() - m_cursorPosition);
+
+        m_text = move(newText);
+        ++m_cursorPosition;
+        update();
+        return;
+    }
+}
+
+void TextBox::timerEvent(TimerEvent&)
+{
+    // FIXME: Disable the timer when not focused.
+    if (!isFocused())
+        return;
+
+    m_cursorBlinkState = !m_cursorBlinkState;
+    update();
+}