LibWeb+Browser: Add a barebones LayoutTreeModel to the inspector window

This allows you to inspect the layout tree, along side the DOM tree.
It will need more functionality to be truly useful, but it's a start.

1 files changed, 61 insertions, 0 deletions

diff --git a/Libraries/LibWeb/LayoutTreeModel.h b/Libraries/LibWeb/LayoutTreeModel.h
new file mode 100644
index 0000000000..2fb8bbca59
--- /dev/null
+++ b/Libraries/LibWeb/LayoutTreeModel.h
@@ -0,0 +1,61 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <LibGUI/Model.h>
+
+namespace Web {
+
+class Document;
+
+class LayoutTreeModel final : public GUI::Model {
+public:
+    static NonnullRefPtr<LayoutTreeModel> create(Document& document)
+    {
+        return adopt(*new LayoutTreeModel(document));
+    }
+
+    virtual ~LayoutTreeModel() override;
+
+    virtual int row_count(const GUI::ModelIndex& = GUI::ModelIndex()) const override;
+    virtual int column_count(const GUI::ModelIndex& = GUI::ModelIndex()) const override;
+    virtual GUI::Variant data(const GUI::ModelIndex&, Role = Role::Display) const override;
+    virtual GUI::ModelIndex index(int row, int column, const GUI::ModelIndex& parent = GUI::ModelIndex()) const override;
+    virtual GUI::ModelIndex parent_index(const GUI::ModelIndex&) const override;
+    virtual void update() override;
+
+private:
+    explicit LayoutTreeModel(Document&);
+
+    NonnullRefPtr<Document> m_document;
+
+    GUI::Icon m_document_icon;
+    GUI::Icon m_element_icon;
+    GUI::Icon m_text_icon;
+};
+
+}