1 files changed, 148 insertions, 0 deletions
diff --git a/Userland/Libraries/LibGUI/BreadcrumbBar.cpp b/Userland/Libraries/LibGUI/BreadcrumbBar.cpp
new file mode 100644
index 0000000000..9df961dc7d
--- /dev/null
+++ b/Userland/Libraries/LibGUI/BreadcrumbBar.cpp
@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <LibGUI/BoxLayout.h>
+#include <LibGUI/BreadcrumbBar.h>
+#include <LibGUI/Button.h>
+#include <LibGUI/Painter.h>
+#include <LibGfx/Font.h>
+#include <LibGfx/Palette.h>
+
+REGISTER_WIDGET(GUI, BreadcrumbBar)
+
+namespace GUI {
+
+class BreadcrumbButton : public Button {
+    C_OBJECT(BreadcrumbButton);
+
+public:
+    virtual ~BreadcrumbButton() override { }
+
+    virtual bool is_uncheckable() const override { return false; }
+    virtual void drop_event(DropEvent& event) override
+    {
+        if (on_drop)
+            on_drop(event);
+    }
+
+    virtual void drag_enter_event(DragEvent& event) override
+    {
+        update();
+        if (on_drag_enter)
+            on_drag_enter(event);
+    }
+
+    virtual void drag_leave_event(Event&) override
+    {
+        update();
+    }
+
+    virtual void paint_event(PaintEvent& event) override
+    {
+        Button::paint_event(event);
+        if (has_pending_drop()) {
+            Painter painter(*this);
+            painter.draw_rect(rect(), palette().selection(), true);
+        }
+    }
+
+    Function<void(DropEvent&)> on_drop;
+    Function<void(DragEvent&)> on_drag_enter;
+
+private:
+    BreadcrumbButton() { }
+};
+
+BreadcrumbBar::BreadcrumbBar()
+{
+    auto& layout = set_layout<HorizontalBoxLayout>();
+    layout.set_spacing(0);
+}
+
+BreadcrumbBar::~BreadcrumbBar()
+{
+}
+
+void BreadcrumbBar::clear_segments()
+{
+    m_segments.clear();
+    remove_all_children();
+}
+
+void BreadcrumbBar::append_segment(const String& text, const Gfx::Bitmap* icon, const String& data)
+{
+    auto& button = add<BreadcrumbButton>();
+    button.set_button_style(Gfx::ButtonStyle::CoolBar);
+    button.set_text(text);
+    button.set_icon(icon);
+    button.set_focus_policy(FocusPolicy::TabFocus);
+    button.set_checkable(true);
+    button.set_exclusive(true);
+    button.on_click = [this, index = m_segments.size()](auto) {
+        if (on_segment_click)
+            on_segment_click(index);
+    };
+    button.on_drop = [this, index = m_segments.size()](auto& drop_event) {
+        if (on_segment_drop)
+            on_segment_drop(index, drop_event);
+    };
+    button.on_drag_enter = [this, index = m_segments.size()](auto& event) {
+        if (on_segment_drag_enter)
+            on_segment_drag_enter(index, event);
+    };
+
+    auto button_text_width = button.font().width(text);
+    auto icon_width = icon ? icon->width() : 0;
+    auto icon_padding = icon ? 4 : 0;
+    button.set_fixed_size(button_text_width + icon_width + icon_padding + 16, 16 + 8);
+
+    Segment segment { icon, text, data, button.make_weak_ptr<GUI::Button>() };
+
+    m_segments.append(move(segment));
+}
+
+void BreadcrumbBar::set_selected_segment(Optional<size_t> index)
+{
+    if (!index.has_value()) {
+        for_each_child_of_type<GUI::AbstractButton>([&](auto& button) {
+            button.set_checked(false);
+            return IterationDecision::Continue;
+        });
+        return;
+    }
+
+    auto& segment = m_segments[index.value()];
+    ASSERT(segment.button);
+    segment.button->set_checked(true);
+}
+
+void BreadcrumbBar::doubleclick_event(MouseEvent& event)
+{
+    if (on_doubleclick)
+        on_doubleclick(event);
+}
+
+}