LibGUI: Add GAbstractView base class for GTableView.

This is in preparation for adding a new view class.

7 files changed, 100 insertions, 64 deletions

diff --git a/LibGUI/GAbstractView.cpp b/LibGUI/GAbstractView.cpp
new file mode 100644
index 0000000000..e4fa01d897
--- /dev/null
+++ b/LibGUI/GAbstractView.cpp
@@ -0,0 +1,35 @@
+#include <LibGUI/GAbstractView.h>
+#include <LibGUI/GModel.h>
+#include <LibGUI/GScrollBar.h>
+#include <SharedGraphics/Painter.h>
+#include <Kernel/KeyCode.h>
+
+GAbstractView::GAbstractView(GWidget* parent)
+    : GScrollableWidget(parent)
+{
+}
+
+GAbstractView::~GAbstractView()
+{
+}
+
+void GAbstractView::set_model(RetainPtr<GModel>&& model)
+{
+    if (model.ptr() == m_model.ptr())
+        return;
+    if (m_model)
+        m_model->unregister_view(Badge<GAbstractView>(), *this);
+    m_model = move(model);
+    if (m_model)
+        m_model->register_view(Badge<GAbstractView>(), *this);
+    did_update_model();
+}
+
+void GAbstractView::model_notification(const GModelNotification&)
+{
+}
+
+void GAbstractView::did_update_model()
+{
+    model_notification(GModelNotification(GModelNotification::ModelUpdated));
+}
diff --git a/LibGUI/GAbstractView.h b/LibGUI/GAbstractView.h
new file mode 100644
index 0000000000..69a45aabad
--- /dev/null
+++ b/LibGUI/GAbstractView.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#include <LibGUI/GModel.h>
+#include <LibGUI/GScrollableWidget.h>
+
+class GAbstractView : public GScrollableWidget {
+    friend class GModel;
+public:
+    explicit GAbstractView(GWidget* parent);
+    virtual ~GAbstractView() override;
+
+    void set_model(RetainPtr<GModel>&&);
+    GModel* model() { return m_model.ptr(); }
+    const GModel* model() const { return m_model.ptr(); }
+
+    void scroll_into_view(const GModelIndex&, Orientation);
+
+    virtual bool accepts_focus() const override { return true; }
+    virtual void did_update_model();
+
+protected:
+    virtual void model_notification(const GModelNotification&);
+
+private:
+    RetainPtr<GModel> m_model;
+};
diff --git a/LibGUI/GModel.cpp b/LibGUI/GModel.cpp
index ebb6e16f36..ca8b3db6d7 100644
--- a/LibGUI/GModel.cpp
+++ b/LibGUI/GModel.cpp
@@ -1,5 +1,5 @@
 #include <LibGUI/GModel.h>
-#include <LibGUI/GTableView.h>
+#include <LibGUI/GAbstractView.h>
 
 GModel::GModel()
 {
@@ -9,17 +9,17 @@ GModel::~GModel()
 {
 }
 
-void GModel::register_view(Badge<GTableView>, GTableView& view)
+void GModel::register_view(Badge<GAbstractView>, GAbstractView& view)
 {
     m_views.set(&view);
 }
 
-void GModel::unregister_view(Badge<GTableView>, GTableView& view)
+void GModel::unregister_view(Badge<GAbstractView>, GAbstractView& view)
 {
     m_views.remove(&view);
 }
 
-void GModel::for_each_view(Function<void(GTableView&)> callback)
+void GModel::for_each_view(Function<void(GAbstractView&)> callback)
 {
     for (auto* view : m_views)
         callback(*view);
@@ -29,7 +29,7 @@ void GModel::did_update()
 {
     if (on_model_update)
         on_model_update(*this);
-    for_each_view([] (GTableView& view) {
+    for_each_view([] (auto& view) {
         view.did_update_model();
     });
 }
diff --git a/LibGUI/GModel.h b/LibGUI/GModel.h
index dd564ff3eb..c565ae8cce 100644
--- a/LibGUI/GModel.h
+++ b/LibGUI/GModel.h
@@ -9,7 +9,7 @@
 #include <SharedGraphics/TextAlignment.h>
 
 class Font;
-class GTableView;
+class GAbstractView;
 
 enum class GSortOrder { None, Ascending, Descending };
 
@@ -70,8 +70,8 @@ public:
     virtual GSortOrder sort_order() const { return GSortOrder::None; }
     virtual void set_key_column_and_sort_order(int, GSortOrder) { }
 
-    void register_view(Badge<GTableView>, GTableView&);
-    void unregister_view(Badge<GTableView>, GTableView&);
+    void register_view(Badge<GAbstractView>, GAbstractView&);
+    void unregister_view(Badge<GAbstractView>, GAbstractView&);
 
     Function<void(GModel&)> on_model_update;
     Function<void(const GModelIndex&)> on_selection_changed;
@@ -79,11 +79,11 @@ public:
 protected:
     GModel();
 
-    void for_each_view(Function<void(GTableView&)>);
+    void for_each_view(Function<void(GAbstractView&)>);
     void did_update();
 
 private:
-    HashTable<GTableView*> m_views;
+    HashTable<GAbstractView*> m_views;
     GModelIndex m_selected_index;
     bool m_activates_on_selection { false };
 };
diff --git a/LibGUI/GTableView.cpp b/LibGUI/GTableView.cpp
index cd54d1d71b..f727fa647b 100644
--- a/LibGUI/GTableView.cpp
+++ b/LibGUI/GTableView.cpp
@@ -5,7 +5,7 @@
 #include <Kernel/KeyCode.h>
 
 GTableView::GTableView(GWidget* parent)
-    : GScrollableWidget(parent)
+    : GAbstractView(parent)
 {
 }
 
@@ -13,31 +13,15 @@ GTableView::~GTableView()
 {
 }
 
-void GTableView::set_model(RetainPtr<GModel>&& model)
-{
-    if (model.ptr() == m_model.ptr())
-        return;
-    if (m_model)
-        m_model->unregister_view(Badge<GTableView>(), *this);
-    m_model = move(model);
-    if (m_model)
-        m_model->register_view(Badge<GTableView>(), *this);
-    update_content_size();
-}
-
-void GTableView::model_notification(const GModelNotification&)
-{
-}
-
 void GTableView::update_content_size()
 {
-    if (!m_model)
+    if (!model())
         return set_content_size({ });
 
     int content_width = 0;
-    int column_count = m_model->column_count();
+    int column_count = model()->column_count();
     for (int i = 0; i < column_count; ++i)
-        content_width += m_model->column_metadata(i).preferred_width + horizontal_padding() * 2;
+        content_width += model()->column_metadata(i).preferred_width + horizontal_padding() * 2;
     int content_height = item_count() * item_height();
 
     set_content_size({ content_width, content_height });
@@ -48,7 +32,7 @@ void GTableView::did_update_model()
 {
     update_content_size();
     update();
-    model_notification(GModelNotification(GModelNotification::ModelUpdated));
+    GAbstractView::did_update_model();
 }
 
 Rect GTableView::row_rect(int item_index) const
@@ -58,7 +42,7 @@ Rect GTableView::row_rect(int item_index) const
 
 int GTableView::column_width(int column_index) const
 {
-    return m_model->column_metadata(column_index).preferred_width;
+    return model()->column_metadata(column_index).preferred_width;
 }
 
 Rect GTableView::header_rect(int column_index) const
@@ -71,7 +55,7 @@ Rect GTableView::header_rect(int column_index) const
             continue;
         x_offset += column_width(i) + horizontal_padding() * 2;
     }
-    auto column_metadata = m_model->column_metadata(column_index);
+    auto column_metadata = model()->column_metadata(column_index);
     int column_width = column_metadata.preferred_width;
     return { x_offset, 0, column_width + horizontal_padding() * 2, header_height() };
 }
@@ -80,15 +64,15 @@ void GTableView::mousedown_event(GMouseEvent& event)
 {
     if (event.y() < header_height()) {
         auto adjusted_position = event.position().translated(horizontal_scrollbar().value(), 0);
-        for (int i = 0; i < m_model->column_count(); ++i) {
+        for (int i = 0; i < model()->column_count(); ++i) {
             auto header_rect = this->header_rect(i);
             if (header_rect.contains(adjusted_position)) {
                 auto new_sort_order = GSortOrder::Ascending;
-                if (m_model->key_column() == i)
-                    new_sort_order = m_model->sort_order() == GSortOrder::Ascending
+                if (model()->key_column() == i)
+                    new_sort_order = model()->sort_order() == GSortOrder::Ascending
                         ? GSortOrder::Descending
                         : GSortOrder::Ascending;
-                m_model->set_key_column_and_sort_order(i, new_sort_order);
+                model()->set_key_column_and_sort_order(i, new_sort_order);
                 return;
             }
         }
@@ -99,12 +83,12 @@ void GTableView::mousedown_event(GMouseEvent& event)
         auto adjusted_position = event.position().translated(0, vertical_scrollbar().value());
         for (int i = 0; i < item_count(); ++i) {
             if (row_rect(i).contains(adjusted_position)) {
-                m_model->set_selected_index({ i, 0 });
+                model()->set_selected_index({ i, 0 });
                 update();
                 return;
             }
         }
-        m_model->set_selected_index({ });
+        model()->set_selected_index({ });
         update();
     }
 }
@@ -120,8 +104,8 @@ void GTableView::paint_event(GPaintEvent& event)
     int painted_item_index = 0;
     int y_offset = header_height();
 
-    for (int row_index = 0; row_index < m_model->row_count(); ++row_index) {
-        bool is_selected_row = row_index == m_model->selected_index().row();
+    for (int row_index = 0; row_index < model()->row_count(); ++row_index) {
+        bool is_selected_row = row_index == model()->selected_index().row();
         int y = y_offset + painted_item_index * item_height();
 
         Color background_color;
@@ -141,20 +125,20 @@ void GTableView::paint_event(GPaintEvent& event)
         painter.fill_rect(row_rect(painted_item_index), background_color);
 
         int x_offset = 0;
-        for (int column_index = 0; column_index < m_model->column_count(); ++column_index) {
+        for (int column_index = 0; column_index < model()->column_count(); ++column_index) {
             if (is_column_hidden(column_index))
                 continue;
-            auto column_metadata = m_model->column_metadata(column_index);
+            auto column_metadata = model()->column_metadata(column_index);
             int column_width = column_metadata.preferred_width;
             const Font& font = column_metadata.font ? *column_metadata.font : this->font();
-            bool is_key_column = m_model->key_column() == column_index;
+            bool is_key_column = model()->key_column() == column_index;
             Rect cell_rect(horizontal_padding() + x_offset, y, column_width, item_height());
             if (is_key_column) {
                 auto cell_rect_for_fill = cell_rect.inflated(horizontal_padding() * 2, 0);
                 painter.fill_rect(cell_rect_for_fill, key_column_background_color);
             }
             GModelIndex cell_index(row_index, column_index);
-            auto data = m_model->data(cell_index);
+            auto data = model()->data(cell_index);
             if (data.is_bitmap()) {
                 painter.blit(cell_rect.location(), data.as_bitmap(), data.as_bitmap().rect());
             } else {
@@ -162,7 +146,7 @@ void GTableView::paint_event(GPaintEvent& event)
                 if (is_selected_row)
                     text_color = Color::White;
                 else
-                    text_color = m_model->data(cell_index, GModel::Role::ForegroundColor).to_color(Color::Black);
+                    text_color = model()->data(cell_index, GModel::Role::ForegroundColor).to_color(Color::Black);
                 painter.draw_text(cell_rect, data.to_string(), font, column_metadata.text_alignment, text_color);
             }
             x_offset += column_width + horizontal_padding() * 2;
@@ -198,17 +182,17 @@ void GTableView::paint_headers(Painter& painter)
     painter.draw_line({ 0, 0 }, { exposed_width - 1, 0 }, Color::White);
     painter.draw_line({ 0, header_height() - 1 }, { exposed_width - 1, header_height() - 1 }, Color::DarkGray);
     int x_offset = 0;
-    for (int column_index = 0; column_index < m_model->column_count(); ++column_index) {
+    for (int column_index = 0; column_index < model()->column_count(); ++column_index) {
         if (is_column_hidden(column_index))
             continue;
-        auto column_metadata = m_model->column_metadata(column_index);
+        auto column_metadata = model()->column_metadata(column_index);
         int column_width = column_metadata.preferred_width;
-        bool is_key_column = m_model->key_column() == column_index;
+        bool is_key_column = model()->key_column() == column_index;
         Rect cell_rect(x_offset, 0, column_width + horizontal_padding() * 2, header_height());
         if (is_key_column) {
             painter.fill_rect(cell_rect.shrunken(2, 2), Color::from_rgb(0xdddddd));
         }
-        painter.draw_text(cell_rect.translated(horizontal_padding(), 0), m_model->column_name(column_index), Font::default_bold_font(), TextAlignment::CenterLeft, Color::Black);
+        painter.draw_text(cell_rect.translated(horizontal_padding(), 0), model()->column_name(column_index), Font::default_bold_font(), TextAlignment::CenterLeft, Color::Black);
         x_offset += column_width + horizontal_padding() * 2;
         // Draw column separator.
         painter.draw_line(cell_rect.top_left().translated(0, 1), cell_rect.bottom_left().translated(0, -1), Color::White);
@@ -220,7 +204,7 @@ void GTableView::paint_headers(Painter& painter)
 
 int GTableView::item_count() const
 {
-    return m_model->row_count();
+    return model()->row_count();
 }
 
 void GTableView::keydown_event(GKeyEvent& event)
diff --git a/LibGUI/GTableView.h b/LibGUI/GTableView.h
index 2d967b0acb..5382a219a6 100644
--- a/LibGUI/GTableView.h
+++ b/LibGUI/GTableView.h
@@ -1,14 +1,14 @@
 #pragma once
 
 #include <LibGUI/GModel.h>
-#include <LibGUI/GScrollableWidget.h>
+#include <LibGUI/GAbstractView.h>
 #include <AK/Function.h>
 #include <AK/HashMap.h>
 
 class GScrollBar;
 class Painter;
 
-class GTableView : public GScrollableWidget {
+class GTableView : public GAbstractView {
 public:
     explicit GTableView(GWidget* parent);
     virtual ~GTableView() override;
@@ -16,31 +16,22 @@ public:
     int header_height() const { return m_headers_visible ? 16 : 0; }
     int item_height() const { return 16; }
 
-    void set_model(RetainPtr<GModel>&&);
-    GModel* model() { return m_model.ptr(); }
-    const GModel* model() const { return m_model.ptr(); }
-
     bool headers_visible() const { return m_headers_visible; }
     void set_headers_visible(bool headers_visible) { m_headers_visible = headers_visible; }
 
     bool alternating_row_colors() const { return m_alternating_row_colors; }
     void set_alternating_row_colors(bool b) { m_alternating_row_colors = b; }
 
-    void did_update_model();
-
     int content_width() const;
     int horizontal_padding() const { return m_horizontal_padding; }
 
-    virtual bool accepts_focus() const override { return true; }
-
     void scroll_into_view(const GModelIndex&, Orientation);
 
     bool is_column_hidden(int) const;
     void set_column_hidden(int, bool);
 
 private:
-    virtual void model_notification(const GModelNotification&);
-
+    virtual void did_update_model() override;
     virtual void paint_event(GPaintEvent&) override;
     virtual void mousedown_event(GMouseEvent&) override;
     virtual void keydown_event(GKeyEvent&) override;
@@ -53,7 +44,6 @@ private:
     void update_content_size();
 
     Vector<bool> m_column_visibility;
-    RetainPtr<GModel> m_model;
     int m_horizontal_padding { 5 };
     bool m_headers_visible { true };
     bool m_alternating_row_colors { true };
diff --git a/LibGUI/Makefile b/LibGUI/Makefile
index 0e5977a077..d7bab746b6 100644
--- a/LibGUI/Makefile
+++ b/LibGUI/Makefile
@@ -48,6 +48,7 @@ LIBGUI_OBJS = \
     GDialog.o \
     GDesktop.o \
     GProgressBar.o \
+    GAbstractView.o \
     GWindow.o
 
 OBJS = $(SHAREDGRAPHICS_OBJS) $(LIBGUI_OBJS)