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[gtk/constraint-grid-3: 2/2] Add two grid constraints demos

commit 138195998d1bafe939bd3c627f6ab012842ced39
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Jul 2 12:55:25 2019 -0400

    Add two grid constraints demos

 demos/gtk-demo/constraints4.c     | 178 +++++++++++++++++++
 demos/gtk-demo/constraints5.c     | 354 ++++++++++++++++++++++++++++++++++++++
 demos/gtk-demo/demo.gresource.xml |   5 +
 demos/gtk-demo/meson.build        |   2 +
 4 files changed, 539 insertions(+)
---
diff --git a/demos/gtk-demo/constraints4.c b/demos/gtk-demo/constraints4.c
new file mode 100644
index 0000000000..5d7a31a95a
--- /dev/null
+++ b/demos/gtk-demo/constraints4.c
@@ -0,0 +1,178 @@
+/* Constraints/Grid
+ *
+ * GtkConstraintLayout lets you define complex layouts
+ * like grids.
+ */
+
+#include <glib/gi18n.h>
+#include <gtk/gtk.h>
+
+G_DECLARE_FINAL_TYPE (ComplexGrid, complex_grid, COMPLEX, GRID, GtkWidget)
+
+struct _ComplexGrid
+{
+  GtkWidget parent_instance;
+
+  GtkWidget *button1, *button2, *button3;
+  GtkWidget *button4, *button5;
+};
+
+G_DEFINE_TYPE (ComplexGrid, complex_grid, GTK_TYPE_WIDGET)
+
+static void
+complex_grid_destroy (GtkWidget *widget)
+{
+  ComplexGrid *self = COMPLEX_GRID (widget);
+
+  g_clear_pointer (&self->button1, gtk_widget_destroy);
+  g_clear_pointer (&self->button2, gtk_widget_destroy);
+  g_clear_pointer (&self->button3, gtk_widget_destroy);
+  g_clear_pointer (&self->button4, gtk_widget_destroy);
+  g_clear_pointer (&self->button5, gtk_widget_destroy);
+
+  GTK_WIDGET_CLASS (complex_grid_parent_class)->destroy (widget);
+}
+
+static void
+complex_grid_class_init (ComplexGridClass *klass)
+{
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+  widget_class->destroy = complex_grid_destroy;
+
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_CONSTRAINT_LAYOUT);
+}
+
+/* Layout:
+ *
+ *   +--------------------------------------+
+ *   |             +-----------+            |
+ *   |             |  Child 4  |            |
+ *   | +-----------+-----------+----------+ |
+ *   | |  Child 1  |  Child 2  |  Child 3 | |
+ *   | +-----------+-----------+----------+ |
+ *   |             |  Child 5  |            |
+ *   |             +-----------+            |
+ *   +--------------------------------------+
+ *
+ */
+static void
+build_constraints (ComplexGrid         *self,
+                   GtkConstraintLayout *manager)
+{
+  GtkGridConstraint *constraint;
+  GtkConstraint *s;
+
+  s = gtk_constraint_new (NULL, GTK_CONSTRAINT_ATTRIBUTE_LEFT,
+                          GTK_CONSTRAINT_RELATION_EQ,
+                          self->button1, GTK_CONSTRAINT_ATTRIBUTE_LEFT,
+                          1.0, 0.0,
+                          GTK_CONSTRAINT_STRENGTH_REQUIRED);
+  gtk_constraint_layout_add_constraint (manager, s);
+
+  s = gtk_constraint_new (self->button3, GTK_CONSTRAINT_ATTRIBUTE_RIGHT,
+                          GTK_CONSTRAINT_RELATION_EQ,
+                          NULL, GTK_CONSTRAINT_ATTRIBUTE_RIGHT,
+                          1.0, 0.0,
+                          GTK_CONSTRAINT_STRENGTH_REQUIRED);
+  gtk_constraint_layout_add_constraint (manager, s);
+
+  s = gtk_constraint_new (NULL, GTK_CONSTRAINT_ATTRIBUTE_TOP,
+                          GTK_CONSTRAINT_RELATION_EQ,
+                          self->button4, GTK_CONSTRAINT_ATTRIBUTE_TOP,
+                          1.0, 0.0,
+                          GTK_CONSTRAINT_STRENGTH_REQUIRED);
+  gtk_constraint_layout_add_constraint (manager, s);
+
+  s = gtk_constraint_new (NULL, GTK_CONSTRAINT_ATTRIBUTE_BOTTOM,
+                          GTK_CONSTRAINT_RELATION_EQ,
+                          self->button5, GTK_CONSTRAINT_ATTRIBUTE_BOTTOM,
+                          1.0, 0.0,
+                          GTK_CONSTRAINT_STRENGTH_REQUIRED);
+  gtk_constraint_layout_add_constraint (manager, s);
+
+  constraint = gtk_grid_constraint_new ();
+  g_object_set (constraint, "column-homogeneous", TRUE, NULL);
+  gtk_grid_constraint_add (constraint, self->button1, 0, 1, 0, 1);
+  gtk_grid_constraint_add (constraint, self->button2, 1, 2, 0, 1);
+  gtk_grid_constraint_add (constraint, self->button3, 2, 3, 0, 1);
+  gtk_grid_constraint_attach (constraint, manager);
+
+  constraint = gtk_grid_constraint_new ();
+  g_object_set (constraint, "row-homogeneous", TRUE, NULL);
+  gtk_grid_constraint_add (constraint, self->button4, 0, 1, 0, 1);
+  gtk_grid_constraint_add (constraint, self->button2, 0, 1, 1, 2);
+  gtk_grid_constraint_add (constraint, self->button5, 0, 1, 2, 3);
+  gtk_grid_constraint_attach (constraint, manager);
+}
+
+static void
+complex_grid_init (ComplexGrid *self)
+{
+  GtkWidget *widget = GTK_WIDGET (self);
+  GtkLayoutManager *manager = gtk_widget_get_layout_manager (GTK_WIDGET (self));
+
+  self->button1 = gtk_button_new_with_label ("Child 1");
+  gtk_widget_set_parent (self->button1, widget);
+  gtk_widget_set_name (self->button1, "button1");
+
+  self->button2 = gtk_button_new_with_label ("Child 2");
+  gtk_widget_set_parent (self->button2, widget);
+  gtk_widget_set_name (self->button2, "button2");
+
+  self->button3 = gtk_button_new_with_label ("Child 3");
+  gtk_widget_set_parent (self->button3, widget);
+  gtk_widget_set_name (self->button3, "button3");
+
+  self->button4 = gtk_button_new_with_label ("Child 4");
+  gtk_widget_set_parent (self->button4, widget);
+  gtk_widget_set_name (self->button4, "button4");
+
+  self->button5 = gtk_button_new_with_label ("Child 5");
+  gtk_widget_set_parent (self->button5, widget);
+  gtk_widget_set_name (self->button5, "button5");
+
+  build_constraints (self, GTK_CONSTRAINT_LAYOUT (manager));
+}
+
+GtkWidget *
+do_constraints4 (GtkWidget *do_widget)
+{
+ static GtkWidget *window;
+
+ if (!window)
+   {
+     GtkWidget *header, *box, *grid, *button;
+
+     window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+     gtk_window_set_display (GTK_WINDOW (window), gtk_widget_get_display (do_widget));
+
+     header = gtk_header_bar_new ();
+     gtk_header_bar_set_title (GTK_HEADER_BAR (header), "Constraints");
+     gtk_header_bar_set_show_title_buttons (GTK_HEADER_BAR (header), FALSE);
+     gtk_window_set_titlebar (GTK_WINDOW (window), header);
+     g_signal_connect (window, "destroy",
+                       G_CALLBACK (gtk_widget_destroyed), &window);
+
+     box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+     gtk_container_add (GTK_CONTAINER (window), box);
+
+     grid = g_object_new (complex_grid_get_type (), NULL);
+     gtk_widget_set_hexpand (grid, TRUE);
+     gtk_widget_set_vexpand (grid, TRUE);
+     gtk_container_add (GTK_CONTAINER (box), grid);
+
+     button = gtk_button_new_with_label ("Close");
+     gtk_container_add (GTK_CONTAINER (box), button);
+     gtk_widget_set_hexpand (grid, TRUE);
+     g_signal_connect_swapped (button, "clicked",
+                               G_CALLBACK (gtk_widget_destroy), window);
+   }
+
+ if (!gtk_widget_get_visible (window))
+   gtk_widget_show (window);
+ else
+   gtk_widget_destroy (window);
+
+ return window;
+}
diff --git a/demos/gtk-demo/constraints5.c b/demos/gtk-demo/constraints5.c
new file mode 100644
index 0000000000..506cae6f26
--- /dev/null
+++ b/demos/gtk-demo/constraints5.c
@@ -0,0 +1,354 @@
+/* Constraints/Words
+ *
+ * GtkConstraintLayout lets you define big grids.
+ */
+
+#include <glib/gi18n.h>
+#include <gtk/gtk.h>
+
+#define WORDS_TYPE_BASE (words_base_get_type ())
+#define WORDS_TYPE_GRID (words_grid_get_type ())
+#define WORDS_TYPE_CONSTRAINT (words_constraint_get_type ())
+
+typedef struct
+{
+  GtkWidget parent_instance;
+} WordsBase;
+
+typedef WordsBase WordsGrid;
+typedef WordsBase WordsConstraint;
+
+typedef GtkWidgetClass WordsBaseClass;
+typedef GtkWidgetClass WordsGridClass;
+typedef GtkWidgetClass WordsConstraintClass;
+
+G_DEFINE_TYPE (WordsBase, words_base, GTK_TYPE_WIDGET)
+G_DEFINE_TYPE (WordsGrid, words_grid, WORDS_TYPE_BASE)
+G_DEFINE_TYPE (WordsConstraint, words_constraint, WORDS_TYPE_BASE)
+
+static void
+words_grid_init (WordsGrid *words)
+{
+}
+
+static void
+words_grid_class_init (WordsGridClass *class)
+{
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
+
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_GRID_LAYOUT);
+}
+
+static void
+words_constraint_init (WordsGrid *words)
+{
+}
+
+static void
+words_constraint_class_init (WordsConstraintClass *class)
+{
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
+
+  gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_CONSTRAINT_LAYOUT);
+}
+
+static void
+word_base_dispose (GObject *object)
+{
+  GtkWidget *self = GTK_WIDGET (object);
+  GtkWidget *child;
+
+  while ((child = gtk_widget_get_first_child (self)) != NULL)
+    gtk_widget_unparent (child);
+
+  G_OBJECT_CLASS (words_base_parent_class)->dispose (object);
+}
+
+static void
+words_base_class_init (WordsBaseClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->dispose = word_base_dispose;
+}
+
+static int num_words = 100;
+static gboolean use_constraints = FALSE;
+
+static void
+read_words (WordsBase *self)
+{
+  GBytes *data;
+  const char *words;
+  int left, top;
+  GtkWidget *child = NULL;
+  GtkLayoutManager *layout = gtk_widget_get_layout_manager (GTK_WIDGET (self));
+  GtkGridConstraint *grid;
+  GtkConstraint *constraint;
+  int count;
+  int rightmost;
+  GtkWidget *right_child = NULL;
+  gboolean use_constraint = GTK_IS_CONSTRAINT_LAYOUT (layout);
+
+  if (use_constraint)
+    {
+      grid = gtk_grid_constraint_new ();
+      g_object_set (grid,
+                    "row-homogeneous", TRUE,
+                    "column-homogeneous", FALSE,
+                    NULL);
+    }
+  else
+    {
+      gtk_grid_layout_set_row_homogeneous (GTK_GRID_LAYOUT (layout), TRUE);
+      gtk_grid_layout_set_column_homogeneous (GTK_GRID_LAYOUT (layout), FALSE);
+    }
+
+  data = g_resources_lookup_data ("/constraints5/words", 0, NULL);
+  words = g_bytes_get_data (data, NULL);
+  count = 0;
+
+  rightmost = 0;
+  left = 0;
+  top = 0;
+  while (words && words[0])
+    {
+      char *p = strchr (words, '\n');
+      char *word;
+      int len;
+
+      if (p)
+        {
+          word = strndup (words, p - words);
+          words = p + 1;
+        }
+      else
+        {
+          word = strdup (words);
+          words = NULL;
+        }
+
+      len = strlen (word);
+      child = gtk_button_new_with_label (word);
+
+      if (left + len > 50)
+        {
+          top++;
+          left = 0;
+        }
+
+      gtk_widget_set_parent (child, GTK_WIDGET (self));
+
+      if (left + len > rightmost)
+        {
+          rightmost = left + len;
+          right_child = child;
+        }
+
+      if (use_constraint)
+        {
+          gtk_grid_constraint_add (grid, child,
+                                   left, left + len,
+                                   top, top + 1);
+          if (left == 0 && top == 0)
+            {
+              constraint = gtk_constraint_new (NULL,
+                                               GTK_CONSTRAINT_ATTRIBUTE_TOP,
+                                               GTK_CONSTRAINT_RELATION_EQ,
+                                               child,
+                                               GTK_CONSTRAINT_ATTRIBUTE_TOP,
+                                               1.0,
+                                               0.0,
+                                               GTK_CONSTRAINT_STRENGTH_REQUIRED);
+              gtk_constraint_layout_add_constraint (GTK_CONSTRAINT_LAYOUT (layout),
+                                                    constraint);
+              constraint = gtk_constraint_new (NULL,
+                                               GTK_CONSTRAINT_ATTRIBUTE_LEFT,
+                                               GTK_CONSTRAINT_RELATION_EQ,
+                                               child,
+                                               GTK_CONSTRAINT_ATTRIBUTE_LEFT,
+                                               1.0,
+                                               0.0,
+                                               GTK_CONSTRAINT_STRENGTH_REQUIRED);
+               gtk_constraint_layout_add_constraint (GTK_CONSTRAINT_LAYOUT (layout),
+                                                     constraint);
+            }
+        }
+      else
+        {
+          GtkGridLayoutChild *grid_child = GTK_GRID_LAYOUT_CHILD (gtk_layout_manager_get_layout_child 
(layout, child));
+
+          g_object_set (grid_child,
+                        "left-attach", left,
+                        "top-attach", top,
+                        "column-span", len,
+                        "row-span", 1,
+                        NULL);
+        }
+
+      left = left + len;
+      count++;
+
+      if (count >= num_words)
+        break;
+    }
+
+  if (use_constraint)
+    {
+      constraint = gtk_constraint_new (NULL,
+                                       GTK_CONSTRAINT_ATTRIBUTE_RIGHT,
+                                       GTK_CONSTRAINT_RELATION_EQ,
+                                       right_child,
+                                       GTK_CONSTRAINT_ATTRIBUTE_RIGHT,
+                                       1.0,
+                                       0.0,
+                                       GTK_CONSTRAINT_STRENGTH_REQUIRED);
+      gtk_constraint_layout_add_constraint (GTK_CONSTRAINT_LAYOUT (layout),
+                                            constraint);
+      constraint = gtk_constraint_new (NULL,
+                                       GTK_CONSTRAINT_ATTRIBUTE_BOTTOM,
+                                       GTK_CONSTRAINT_RELATION_EQ,
+                                       child,
+                                       GTK_CONSTRAINT_ATTRIBUTE_BOTTOM,
+                                       1.0,
+                                       0.0,
+                                       GTK_CONSTRAINT_STRENGTH_REQUIRED);
+      gtk_constraint_layout_add_constraint (GTK_CONSTRAINT_LAYOUT (layout),
+                                            constraint);
+
+      gtk_grid_constraint_attach (grid, GTK_CONSTRAINT_LAYOUT (layout));
+    }
+
+  g_bytes_unref (data);
+}
+
+static void
+words_base_init (WordsBase *self)
+{
+  read_words (self);
+}
+
+static void
+show_words (GtkWidget *parent)
+{
+  GtkWidget *window;
+  GtkWidget *header, *box, *grid, *button;
+  GtkWidget *swin;
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  gtk_window_set_transient_for (GTK_WINDOW (window),
+                                GTK_WINDOW (gtk_widget_get_root (parent)));
+  gtk_window_set_modal (GTK_WINDOW (window), TRUE);
+
+  header = gtk_header_bar_new ();
+  gtk_header_bar_set_title (GTK_HEADER_BAR (header), use_constraints ? "Constraints" : "Grid");
+  gtk_header_bar_set_show_title_buttons (GTK_HEADER_BAR (header), FALSE);
+  gtk_window_set_titlebar (GTK_WINDOW (window), header);
+  gtk_window_set_resizable (GTK_WINDOW (window), TRUE);
+  gtk_window_set_default_size (GTK_WINDOW (window), 600, 400);
+
+  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+  gtk_container_add (GTK_CONTAINER (window), box);
+
+  swin = gtk_scrolled_window_new (NULL, NULL);
+  gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (swin),
+                                  GTK_POLICY_AUTOMATIC,
+                                  GTK_POLICY_AUTOMATIC);
+  gtk_scrolled_window_set_propagate_natural_width (GTK_SCROLLED_WINDOW (swin), TRUE);
+  gtk_scrolled_window_set_propagate_natural_height (GTK_SCROLLED_WINDOW (swin), TRUE);
+  gtk_widget_set_hexpand (swin, TRUE);
+  gtk_widget_set_vexpand (swin, TRUE);
+  gtk_widget_set_halign (swin, GTK_ALIGN_FILL);
+  gtk_widget_set_valign (swin, GTK_ALIGN_FILL);
+  gtk_container_add (GTK_CONTAINER (box), swin);
+
+  if (use_constraints)
+    grid = g_object_new (WORDS_TYPE_CONSTRAINT, NULL);
+  else
+    grid = g_object_new (WORDS_TYPE_GRID, NULL);
+
+  gtk_widget_set_halign (swin, GTK_ALIGN_START);
+  gtk_widget_set_valign (swin, GTK_ALIGN_START);
+
+  gtk_container_add (GTK_CONTAINER (swin), grid);
+
+  button = gtk_button_new_with_label ("Close");
+  gtk_container_add (GTK_CONTAINER (box), button);
+  g_signal_connect_swapped (button, "clicked",
+                            G_CALLBACK (gtk_widget_destroy), window);
+
+  gtk_widget_show (window);
+}
+
+static void
+use_constraints_cb (GtkButton *button)
+{
+  use_constraints = gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (button));
+}
+
+static void
+word_count_cb (GtkSpinButton *button)
+{
+  num_words = gtk_spin_button_get_value_as_int (button);
+}
+
+GtkWidget *
+do_constraints5 (GtkWidget *do_widget)
+{
+ static GtkWidget *window;
+
+ if (!window)
+   {
+     GtkWidget *header, *grid, *button, *label;
+
+     window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+
+     header = gtk_header_bar_new ();
+     gtk_header_bar_set_title (GTK_HEADER_BAR (header), "Words");
+     gtk_header_bar_set_show_title_buttons (GTK_HEADER_BAR (header), TRUE);
+     gtk_window_set_titlebar (GTK_WINDOW (window), header);
+     gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
+     g_signal_connect (window, "destroy",
+                       G_CALLBACK (gtk_widget_destroyed), &window);
+
+     grid = gtk_grid_new ();
+     g_object_set (grid,
+                   "margin", 12,
+                   "row-spacing", 12,
+                   "column-spacing", 6,
+                   "halign", GTK_ALIGN_FILL,
+                   "valign", GTK_ALIGN_FILL,
+                   "hexpand", TRUE,
+                   "vexpand", TRUE,
+                   NULL);
+     gtk_container_add (GTK_CONTAINER (window), grid);
+
+     label = gtk_label_new ("Constraints:");
+     gtk_label_set_xalign (GTK_LABEL (label), 1.0);
+     gtk_grid_attach (GTK_GRID (grid), label, 0, 0, 1, 1);
+     button = gtk_check_button_new ();
+     g_signal_connect (button, "clicked", G_CALLBACK (use_constraints_cb), NULL);
+     gtk_grid_attach (GTK_GRID (grid), button, 1, 0, 1, 1);
+     label = gtk_label_new ("Words:");
+     gtk_label_set_xalign (GTK_LABEL (label), 1.0);
+     gtk_grid_attach (GTK_GRID (grid), label, 0, 1, 1, 1);
+     button = gtk_spin_button_new_with_range (0, 1300, 1);
+     g_signal_connect (button, "value-changed", G_CALLBACK (word_count_cb), NULL);
+     gtk_spin_button_set_value (GTK_SPIN_BUTTON (button), 10);
+     gtk_grid_attach (GTK_GRID (grid), button, 1, 1, 1, 1);
+
+     button = gtk_button_new_with_label ("Show");
+     gtk_widget_set_halign (button, GTK_ALIGN_END);
+     gtk_widget_set_valign (button, GTK_ALIGN_END);
+     g_signal_connect_swapped (button, "clicked",
+                               G_CALLBACK (show_words), window);
+     gtk_grid_attach (GTK_GRID (grid), button, 0, 2, 2, 1);
+   }
+
+ if (!gtk_widget_get_visible (window))
+   gtk_widget_show (window);
+ else
+   gtk_widget_destroy (window);
+
+ return window;
+}
diff --git a/demos/gtk-demo/demo.gresource.xml b/demos/gtk-demo/demo.gresource.xml
index 6b6205b6b7..5d26f15236 100644
--- a/demos/gtk-demo/demo.gresource.xml
+++ b/demos/gtk-demo/demo.gresource.xml
@@ -59,6 +59,9 @@
     <file>cssview.css</file>
     <file>reset.css</file>
   </gresource>
+  <gresource prefix="/constraints5">
+    <file>words</file>
+  </gresource>
   <gresource prefix="/cursors">
     <file>cursors.ui</file>
     <file>alias_cursor.png</file>
@@ -153,6 +156,8 @@
     <file>constraints.c</file>
     <file>constraints2.c</file>
     <file>constraints3.c</file>
+    <file>constraints4.c</file>
+    <file>constraints5.c</file>
     <file>css_accordion.c</file>
     <file>css_basics.c</file>
     <file>css_blendmodes.c</file>
diff --git a/demos/gtk-demo/meson.build b/demos/gtk-demo/meson.build
index b6f52cb25c..8b2c9de749 100644
--- a/demos/gtk-demo/meson.build
+++ b/demos/gtk-demo/meson.build
@@ -11,6 +11,8 @@ demos = files([
   'constraints.c',
   'constraints2.c',
   'constraints3.c',
+  'constraints4.c',
+  'constraints5.c',
   'css_accordion.c',
   'css_basics.c',
   'css_blendmodes.c',
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