accdd92110
Added 3 examples for the box layout recipe: 1) Simple box layout demonstrating how to set actor properties 2) Trivial menu implementation using box layout 3) Demonstration app which enables tweaking and testing of layout property interactions Also inlined example 1 in the solution section and added more explanatory text in the discussion.
465 lines
15 KiB
C
465 lines
15 KiB
C
/*
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* Experiment with permutations of layout properties for a ClutterBoxLayout
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*
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* See the text (in brackets) at the bottom of the application
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* window for available key presses
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*/
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#include <stdlib.h>
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#include <clutter/clutter.h>
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#define STAGE_SIDE 510
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#define BOX_SIDE STAGE_SIDE * 0.75
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#define RED_SIDE STAGE_SIDE / 4
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#define GREEN_SIDE STAGE_SIDE / 8
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#define BLUE_SIDE STAGE_SIDE / 16
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typedef struct
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{
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ClutterLayoutManager *box_layout;
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ClutterActor *box;
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ClutterActor *status_display;
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gboolean x_fill;
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gboolean y_fill;
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gboolean expand;
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ClutterBoxAlignment x_align;
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ClutterBoxAlignment y_align;
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} State;
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static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
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static const ClutterColor box_color = { 0x66, 0x66, 0x00, 0xff };
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static const ClutterColor red_color = { 0xff, 0x00, 0x00, 0xff };
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static const ClutterColor green_color = { 0x00, 0xff, 0x00, 0xff };
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static const ClutterColor blue_color = { 0x00, 0x00, 0xff, 0xff };
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static const ClutterColor white_color = { 0xff, 0xff, 0xff, 0xff };
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static GValue
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gboolean_to_gvalue (gboolean value)
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{
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GValue gval = {0};
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g_value_init (&gval, G_TYPE_BOOLEAN);
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g_value_set_boolean (&gval, value);
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return gval;
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}
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static GValue
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alignment_to_gvalue (ClutterBoxAlignment value)
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{
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GValue gval = {0};
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g_value_init (&gval, G_TYPE_INT);
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g_value_set_int (&gval, value);
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return gval;
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}
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static gchar*
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alignment_as_string (ClutterBoxAlignment value)
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{
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gchar *align_string = "start ";
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switch (value)
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{
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case CLUTTER_BOX_ALIGNMENT_CENTER:
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align_string = "center";
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break;
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case CLUTTER_BOX_ALIGNMENT_END:
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align_string = "end ";
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break;
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case CLUTTER_BOX_ALIGNMENT_START:
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align_string = "start ";
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break;
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}
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return align_string;
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}
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static ClutterBoxAlignment
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get_next_alignment (ClutterBoxAlignment alignment)
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{
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alignment++;
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if (alignment > CLUTTER_BOX_ALIGNMENT_CENTER)
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alignment = CLUTTER_BOX_ALIGNMENT_START;
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return alignment;
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}
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static void
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show_status (State *state)
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{
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ClutterText *text = CLUTTER_TEXT (state->status_display);
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ClutterBoxLayout *box_layout = CLUTTER_BOX_LAYOUT (state->box_layout);
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gboolean homogeneous = clutter_box_layout_get_homogeneous (box_layout);
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gboolean vertical = clutter_box_layout_get_vertical (box_layout);
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gchar *message = g_strdup_printf ("x_fill (x): %s\t\t\t"
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"y_fill (y): %s\n"
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"expand (e): %s\t\t"
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"homogeneous (h): %s\n"
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"spacing (+/-): %dpx\t\t"
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"vertical (v): %s\n"
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"x_align (right): %s\t"
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"y_align (up): %s",
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(state->x_fill ? "true" : "false"),
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(state->y_fill ? "true" : "false"),
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(state->expand ? "true" : "false"),
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(homogeneous ? "true" : "false"),
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clutter_box_layout_get_spacing (box_layout),
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(vertical ? "true" : "false"),
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alignment_as_string (state->x_align),
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alignment_as_string (state->y_align));
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clutter_text_set_text (text, message);
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g_free (message);
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}
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static void
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set_property_on_layout_children (State *state,
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const gchar *property,
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GValue value)
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{
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ClutterActor *actor;
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ClutterContainer *container = CLUTTER_CONTAINER (state->box);
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ClutterLayoutManager *manager = CLUTTER_LAYOUT_MANAGER (state->box_layout);
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GList *actors = clutter_container_get_children (container);
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for (; actors; actors = actors->next)
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{
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actor = CLUTTER_ACTOR (actors->data);
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clutter_layout_manager_child_set_property (manager,
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container,
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actor,
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property,
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&value);
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}
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g_list_free (actors);
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}
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static void
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toggle_x_fill (GObject *instance,
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const gchar *action_name,
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guint key_val,
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ClutterModifierType modifiers,
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gpointer user_data)
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{
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State *state = (State *) user_data;
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state->x_fill = !state->x_fill;
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set_property_on_layout_children (state,
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"x-fill",
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gboolean_to_gvalue (state->x_fill));
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}
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static void
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toggle_y_fill (GObject *instance,
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const gchar *action_name,
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guint key_val,
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ClutterModifierType modifiers,
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gpointer user_data)
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{
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State *state = (State *) user_data;
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state->y_fill = !state->y_fill;
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set_property_on_layout_children (state,
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"y-fill",
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gboolean_to_gvalue (state->y_fill));
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}
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static void
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toggle_expand (GObject *instance,
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const gchar *action_name,
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guint key_val,
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ClutterModifierType modifiers,
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gpointer user_data)
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{
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State *state = (State *) user_data;
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state->expand = !state->expand;
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set_property_on_layout_children (state,
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"expand",
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gboolean_to_gvalue (state->expand));
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}
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static void
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rotate_x_alignment (GObject *instance,
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const gchar *action_name,
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guint key_val,
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ClutterModifierType modifiers,
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gpointer user_data)
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{
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State *state = (State *) user_data;
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state->x_align = get_next_alignment (state->x_align);
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set_property_on_layout_children (state,
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"x-align",
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alignment_to_gvalue (state->x_align));
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}
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static void
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rotate_y_alignment (GObject *instance,
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const gchar *action_name,
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guint key_val,
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ClutterModifierType modifiers,
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gpointer user_data)
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{
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State *state = (State *) user_data;
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state->y_align = get_next_alignment (state->y_align);
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set_property_on_layout_children (state,
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"y-align",
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alignment_to_gvalue (state->y_align));
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}
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static void
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toggle_vertical (GObject *instance,
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const gchar *action_name,
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guint key_val,
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ClutterModifierType modifiers,
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gpointer user_data)
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{
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State *state = (State *) user_data;
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ClutterBoxLayout *box_layout = CLUTTER_BOX_LAYOUT (state->box_layout);
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gboolean vertical = clutter_box_layout_get_vertical (box_layout);
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clutter_box_layout_set_vertical (box_layout, !vertical);
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}
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static void
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toggle_homogeneous (GObject *instance,
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const gchar *action_name,
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guint key_val,
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ClutterModifierType modifiers,
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gpointer user_data)
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{
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State *state = (State *) user_data;
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ClutterBoxLayout *box_layout = CLUTTER_BOX_LAYOUT (state->box_layout);
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gboolean homogeneous = clutter_box_layout_get_homogeneous (box_layout);
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clutter_box_layout_set_homogeneous (box_layout, !homogeneous);
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}
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static void
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increase_spacing (GObject *instance,
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const gchar *action_name,
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guint key_val,
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ClutterModifierType modifiers,
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gpointer user_data)
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{
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State *state = (State *) user_data;
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ClutterBoxLayout *box_layout = CLUTTER_BOX_LAYOUT (state->box_layout);
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guint spacing = clutter_box_layout_get_spacing (box_layout) + 5;
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clutter_box_layout_set_spacing (box_layout, spacing);
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}
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static void
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decrease_spacing (GObject *instance,
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const gchar *action_name,
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guint key_val,
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ClutterModifierType modifiers,
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gpointer user_data)
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{
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State *state = (State *) user_data;
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ClutterBoxLayout *box_layout = CLUTTER_BOX_LAYOUT (state->box_layout);
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guint spacing = clutter_box_layout_get_spacing (box_layout);
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if (spacing >= 5)
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clutter_box_layout_set_spacing (box_layout, spacing - 5);
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}
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static gboolean
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key_pressed_cb (ClutterActor *actor,
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ClutterEvent *event,
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gpointer user_data)
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{
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State *state = (State *) user_data;
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ClutterBindingPool *pool;
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gboolean return_value;
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pool = clutter_binding_pool_find (G_OBJECT_TYPE_NAME (actor));
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return_value = clutter_binding_pool_activate (pool,
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clutter_event_get_key_symbol (event),
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clutter_event_get_state (event),
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G_OBJECT (actor));
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show_status (state);
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return return_value;
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}
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int
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main (int argc,
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char *argv[])
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{
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ClutterActor *stage;
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GObjectClass *stage_class;
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ClutterBindingPool *binding_pool;
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ClutterActor *red;
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ClutterActor *green;
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ClutterActor *blue;
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State *state = g_new0 (State, 1);
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clutter_init (&argc, &argv);
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state->x_fill = FALSE;
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state->y_fill = FALSE;
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state->expand = FALSE;
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state->x_align = CLUTTER_BOX_ALIGNMENT_START;
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stage = clutter_stage_get_default ();
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clutter_actor_set_size (stage, STAGE_SIDE, STAGE_SIDE);
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clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
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g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
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/* for key bindings */
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stage_class = G_OBJECT_GET_CLASS (stage);
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binding_pool = clutter_binding_pool_get_for_class (stage_class);
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clutter_binding_pool_install_action (binding_pool,
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"toggle-expand",
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CLUTTER_KEY_e,
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0,
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G_CALLBACK (toggle_expand),
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state,
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NULL);
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clutter_binding_pool_install_action (binding_pool,
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"toggle-x-fill",
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CLUTTER_KEY_x,
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0,
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G_CALLBACK (toggle_x_fill),
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state,
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NULL);
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clutter_binding_pool_install_action (binding_pool,
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"toggle-y-fill",
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CLUTTER_KEY_y,
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0,
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G_CALLBACK (toggle_y_fill),
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state,
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NULL);
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clutter_binding_pool_install_action (binding_pool,
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"toggle-vertical",
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CLUTTER_KEY_v,
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0,
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G_CALLBACK (toggle_vertical),
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state,
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NULL);
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clutter_binding_pool_install_action (binding_pool,
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"toggle-homogeneous",
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CLUTTER_KEY_h,
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0,
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G_CALLBACK (toggle_homogeneous),
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state,
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NULL);
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clutter_binding_pool_install_action (binding_pool,
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"rotate-x-alignment",
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CLUTTER_KEY_Right,
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0,
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G_CALLBACK (rotate_x_alignment),
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state,
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NULL);
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clutter_binding_pool_install_action (binding_pool,
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"rotate-y-alignment",
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CLUTTER_KEY_Up,
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0,
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G_CALLBACK (rotate_y_alignment),
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state,
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NULL);
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clutter_binding_pool_install_action (binding_pool,
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"increase-spacing",
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CLUTTER_KEY_plus,
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CLUTTER_SHIFT_MASK,
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G_CALLBACK (increase_spacing),
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state,
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NULL);
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clutter_binding_pool_install_action (binding_pool,
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"decrease-spacing",
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CLUTTER_KEY_minus,
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0,
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G_CALLBACK (decrease_spacing),
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state,
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NULL);
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/* rectangles inside the layout */
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red = clutter_rectangle_new_with_color (&red_color);
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clutter_actor_set_size (red, RED_SIDE, RED_SIDE);
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green = clutter_rectangle_new_with_color (&green_color);
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clutter_actor_set_size (green, GREEN_SIDE, GREEN_SIDE);
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blue = clutter_rectangle_new_with_color (&blue_color);
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clutter_actor_set_size (blue, BLUE_SIDE, BLUE_SIDE);
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/* the layout */
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state->box_layout = clutter_box_layout_new ();
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clutter_box_layout_set_use_animations (CLUTTER_BOX_LAYOUT (state->box_layout),
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TRUE);
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state->box = clutter_box_new (state->box_layout);
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clutter_box_set_color (CLUTTER_BOX (state->box), &box_color);
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clutter_actor_set_size (state->box, BOX_SIDE, BOX_SIDE);
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clutter_actor_add_constraint (state->box,
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clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0.5));
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clutter_actor_add_constraint (state->box,
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clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.1));
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/* text to show status */
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state->status_display = clutter_text_new ();
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clutter_text_set_color (CLUTTER_TEXT (state->status_display), &white_color);
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clutter_actor_set_size (state->status_display,
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STAGE_SIDE,
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STAGE_SIDE * 0.2);
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clutter_actor_set_position (state->status_display,
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(STAGE_SIDE - BOX_SIDE) / 2,
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STAGE_SIDE * 0.8);
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/* set text for initial state */
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show_status (state);
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/* connect key presses to a callback on the binding pool */
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g_signal_connect (stage,
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"key-press-event",
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G_CALLBACK (key_pressed_cb),
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state);
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/* pack UI */
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clutter_container_add (CLUTTER_CONTAINER (state->box), red, green, blue, NULL);
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clutter_container_add (CLUTTER_CONTAINER (stage),
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state->box,
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state->status_display,
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NULL);
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/* show stage */
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clutter_actor_show (stage);
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clutter_main ();
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/* clean up */
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g_object_unref (binding_pool);
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g_free (state);
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return EXIT_SUCCESS;
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}
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