Add a basic Listbox widget.

Widgets/ListBox.cpp

@@ -0,0 +1,58 @@
+#include "ListBox.h"
+#include "Painter.h"
+#include "Font.h"
+
+ListBox::ListBox(Widget* parent)
+    : Widget(parent)
+{
+}
+
+ListBox::~ListBox()
+{
+}
+
+unsigned ListBox::itemHeight() const
+{
+    return Font::defaultFont().glyphHeight() + 2;
+}
+
+void ListBox::onPaint(PaintEvent&)
+{
+    Painter painter(*this);
+    painter.fillRect(rect(), Color::White);
+    painter.drawRect(rect(), Color::Black);
+
+    for (unsigned i = m_scrollOffset; i < m_items.size(); ++i) {
+        Rect itemRect(1, 1 + (i * itemHeight()), width() - 2, itemHeight());
+        Rect textRect(itemRect.x() + 1, itemRect.y() + 1, itemRect.width() - 2, itemRect.height() - 2);
+
+        Color itemTextColor = foregroundColor();
+        if (m_selectedIndex == i) {
+            painter.fillRect(itemRect, Color(0, 32, 128));
+            itemTextColor = Color::White;
+        }
+        painter.drawText(textRect, m_items[i], Painter::TextAlignment::TopLeft, itemTextColor);
+    }
+}
+
+void ListBox::onMouseDown(MouseEvent& event)
+{
+    printf("ListBox::onMouseDown %d,%d\n", event.x(), event.y());
+    for (unsigned i = m_scrollOffset; i < m_items.size(); ++i) {
+        Rect itemRect(1, 1 + (i * itemHeight()), width() - 2, itemHeight());
+        if (itemRect.contains(event.position())) {
+            m_selectedIndex = i;
+            printf("ListBox: selected item %u (\"%s\")\n", i, m_items[i].characters());
+            update();
+            return;
+        }
+    }
+}
+
+void ListBox::addItem(String&& item)
+{
+    m_items.append(std::move(item));
+    if (m_selectedIndex == -1)
+        m_selectedIndex = 0;
+}
+

Widgets/ListBox.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "Widget.h"
+
+class ListBox final : public Widget {
+public:
+    explicit ListBox(Widget* parent);
+    virtual ~ListBox() override;
+
+    void addItem(String&&);
+    int selectedIndex() const { return m_selectedIndex; }
+
+private:
+    virtual void onPaint(PaintEvent&) override;
+    virtual void onMouseDown(MouseEvent&) override;
+
+    unsigned itemHeight() const;
+
+    unsigned m_scrollOffset { 0 };
+    int m_selectedIndex { -1 };
+
+    Vector<String> m_items;
+};
+

Widgets/Makefile

@@ -25,6 +25,7 @@ VFS_OBJS = \
     ClockWidget.o \
     CBitmap.o \
     CheckBox.o \
+    ListBox.o \
     test.o
 
 OBJS = $(AK_OBJS) $(VFS_OBJS)

Widgets/Window.cpp

@@ -50,7 +50,7 @@ void Window::event(Event& event)
 {
     if (event.isMouseEvent()) {
         auto& me = static_cast<MouseEvent&>(event);
-        printf("Window{%p}: %s %d,%d\n", this, me.name(), me.x(), me.y());
+        //printf("Window{%p}: %s %d,%d\n", this, me.name(), me.x(), me.y());
         if (m_mainWidget) {
             auto result = m_mainWidget->hitTest(me.x(), me.y());
             //printf("hit test for %d,%d found: %s{%p} %d,%d\n", me.x(), me.y(), result.widget->className(), result.widget, result.localX, result.localY);

Widgets/test.cpp

@@ -8,6 +8,7 @@
 #include "Window.h"
 #include "ClockWidget.h"
 #include "CheckBox.h"
+#include "ListBox.h"
 #include <cstdio>
 
 int main(int argc, char** argv)
@@ -47,7 +48,7 @@ int main(int argc, char** argv)
     {
         auto* widgetTestWindow = new Window;
         widgetTestWindow->setTitle("Widget test");
-        widgetTestWindow->setRect({ 20, 40, 100, 60 });
+        widgetTestWindow->setRect({ 20, 40, 100, 160 });
 
         auto* widgetTestWindowWidget = new Widget;
         widgetTestWindowWidget->setWindowRelativeRect({ 0, 0, 100, 100 });
@@ -64,6 +65,13 @@ int main(int argc, char** argv)
         auto* c = new CheckBox(widgetTestWindowWidget);
         c->setWindowRelativeRect({ 0, 40, 100, 20 });
         c->setCaption("CheckBox");
+
+        auto *lb = new ListBox(widgetTestWindowWidget);
+        lb->setWindowRelativeRect({0, 60, 100, 100 });
+        lb->addItem("This");
+        lb->addItem("is");
+        lb->addItem("a");
+        lb->addItem("ListBox");
     }
 
     auto* win = new Window;