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cookbook: Add examples and more text for "box layout" recipe

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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.
This commit is contained in:
Elliot Smith
2010-12-15 13:13:28 +00:00
committed by Emmanuele Bassi
parent 77aacd185d
commit accdd92110
6 changed files with 841 additions and 10 deletions
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6
doc/cookbook/examples/Makefile.am
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@ -21,6 +21,9 @@ noinst_PROGRAMS = \
layouts-bind-constraint-allocation \
layouts-bind-constraint-overlay \
layouts-bind-constraint-stage \
layouts-box \
layouts-box-menu \
layouts-box-property-effects \
layouts-stacking \
layouts-stacking-diff-sized-actors \
events-mouse-scroll \
@ -77,6 +80,9 @@ textures_sub_texture_SOURCES = textures-sub-texture.c
layouts_bind_constraint_allocation_SOURCES = layouts-bind-constraint-allocation.c
layouts_bind_constraint_overlay_SOURCES = layouts-bind-constraint-overlay.c
layouts_bind_constraint_stage_SOURCES = layouts-bind-constraint-stage.c
layouts_box_SOURCES = layouts-box.c
layouts_box_menu_SOURCES = layouts-box-menu.c
layouts_box_property_effects_SOURCES = layouts-box-property-effects.c
layouts_stacking_SOURCES = layouts-stacking.c
layouts_stacking_diff_sized_actors_SOURCES = layouts-stacking-diff-sized-actors.c
events_mouse_scroll_SOURCES = events-mouse-scroll.c

151
doc/cookbook/examples/layouts-box-menu.c Normal file
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@ -0,0 +1,151 @@
#include <stdlib.h>
#include <clutter/clutter.h>
#define FONT "Sans 20px"
static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
static const ClutterColor yellow_color = { 0xaa, 0xaa, 0x00, 0xff };
static const ClutterColor black_color = { 0x00, 0x00, 0x00, 0xff };
static void
menu_run_option (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
g_debug ("%s pressed", (gchar *) user_data);
}
static void
menu_add_option (ClutterBox *menu,
gchar *text,
gchar *shortcut)
{
ClutterActor *entry;
entry = clutter_box_new (clutter_bin_layout_new (CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_BIN_ALIGNMENT_CENTER));
clutter_box_set_color (CLUTTER_BOX (entry), &black_color);
clutter_actor_set_width (entry, 250);
clutter_actor_set_reactive (entry, TRUE);
clutter_box_pack (CLUTTER_BOX (entry),
clutter_text_new_full (FONT, text, &yellow_color),
"x-align", CLUTTER_BIN_ALIGNMENT_START,
NULL);
clutter_box_pack (CLUTTER_BOX (entry),
clutter_text_new_full (FONT, shortcut, &yellow_color),
"x-align", CLUTTER_BIN_ALIGNMENT_END,
NULL);
clutter_container_add_actor (CLUTTER_CONTAINER (menu), entry);
g_signal_connect (entry,
"button-press-event",
G_CALLBACK (menu_run_option),
text);
}
static void
menu_toggle (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
ClutterAnimation *animation;
ClutterActor *menu = CLUTTER_ACTOR (user_data);
if (clutter_actor_get_animation (menu))
return;
if (clutter_actor_get_opacity (menu) > 0)
{
animation = clutter_actor_animate (menu, CLUTTER_EASE_OUT_CUBIC, 200,
"opacity", 0,
NULL);
/* hide the menu once it is fully transparent */
g_signal_connect_swapped (animation,
"completed",
G_CALLBACK (clutter_actor_hide),
menu);
}
else
{
clutter_actor_show (menu);
clutter_actor_animate (menu, CLUTTER_EASE_OUT_CUBIC, 200,
"opacity", 255,
NULL);
}
}
int
main (int argc,
char *argv[])
{
ClutterActor *stage;
ClutterActor *button;
ClutterLayoutManager *menu_layout;
ClutterActor *menu;
clutter_init (&argc, &argv);
stage = clutter_stage_get_default ();
clutter_actor_set_size (stage, 400, 400);
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
/* button */
button = clutter_box_new (clutter_bin_layout_new (CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_BIN_ALIGNMENT_CENTER));
clutter_actor_set_width (button, 100);
clutter_actor_set_position (button, 50, 50);
clutter_actor_set_reactive (button, TRUE);
clutter_box_set_color (CLUTTER_BOX (button), &black_color);
clutter_box_pack (CLUTTER_BOX (button),
clutter_text_new_full (FONT, "Edit", &yellow_color),
"x-align", CLUTTER_BIN_ALIGNMENT_FILL,
"y-align", CLUTTER_BIN_ALIGNMENT_FILL,
NULL);
/* menu */
menu_layout = clutter_box_layout_new ();
clutter_box_layout_set_homogeneous (CLUTTER_BOX_LAYOUT (menu_layout), TRUE);
clutter_box_layout_set_vertical (CLUTTER_BOX_LAYOUT (menu_layout), TRUE);
clutter_box_layout_set_spacing (CLUTTER_BOX_LAYOUT (menu_layout), 2);
menu = clutter_box_new (menu_layout);
clutter_box_set_color (CLUTTER_BOX (menu), &yellow_color);
menu_add_option (CLUTTER_BOX (menu), "Undo", "Ctrl-z");
menu_add_option (CLUTTER_BOX (menu), "Redo", "Ctrl-Shift-z");
menu_add_option (CLUTTER_BOX (menu), "Cut", "Ctrl-x");
menu_add_option (CLUTTER_BOX (menu), "Copy", "Ctrl-c");
menu_add_option (CLUTTER_BOX (menu), "Paste", "Ctrl-v");
/* align left-hand side of menu with left-hand side of button */
clutter_actor_add_constraint (menu, clutter_align_constraint_new (button,
CLUTTER_ALIGN_X_AXIS,
0.0));
/* align top of menu with the bottom of the button */
clutter_actor_add_constraint (menu, clutter_bind_constraint_new (button,
CLUTTER_BIND_Y,
clutter_actor_get_height (button)));
/* hide the menu until we're ready to animate it in */
clutter_actor_set_opacity (menu, 0);
clutter_actor_hide (menu);
/* clicking on the button toggles the menu */
g_signal_connect (button, "button-press-event", G_CALLBACK (menu_toggle), menu);
clutter_container_add_actor (CLUTTER_CONTAINER (stage), menu);
clutter_container_add_actor (CLUTTER_CONTAINER (stage), button);
clutter_actor_show (stage);
clutter_main ();
return EXIT_SUCCESS;
}

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

95
doc/cookbook/examples/layouts-box.c Normal file
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@ -0,0 +1,95 @@
#include <stdlib.h>
#include <clutter/clutter.h>
static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
static const ClutterColor box_color = { 0xff, 0xff, 0xff, 0xff };
static const ClutterColor yellow_color = { 0xaa, 0xaa, 0x00, 0xff };
static const ClutterColor red_color = { 0xff, 0x00, 0x00, 0xff };
static const ClutterColor blue_color = { 0x00, 0x00, 0xff, 0xff };
int
main (int argc,
char *argv[])
{
ClutterActor *stage;
ClutterLayoutManager *box_layout;
ClutterActor *box;
ClutterActor *yellow;
ClutterActor *red;
ClutterActor *blue;
clutter_init (&argc, &argv);
stage = clutter_stage_get_default ();
clutter_actor_set_size (stage, 400, 400);
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
/* create a ClutterBoxLayout */
box_layout = clutter_box_layout_new ();
/* configure it to lay out actors vertically */
clutter_box_layout_set_vertical (CLUTTER_BOX_LAYOUT (box_layout), TRUE);
/* put 5px of spacing between actors */
clutter_box_layout_set_spacing (CLUTTER_BOX_LAYOUT (box_layout), 5);
/* actors are packed into this box; we set its width, but
* allow its height to be determined by the children it contains
*/
box = clutter_box_new (box_layout);
clutter_box_set_color (CLUTTER_BOX (box), &box_color);
clutter_actor_set_position (box, 100, 50);
clutter_actor_set_width (box, 200);
/* pack an actor into the layout and set all layout properties on it
* at the same time
*/
yellow = clutter_rectangle_new_with_color (&yellow_color);
clutter_actor_set_size (yellow, 100, 100);
clutter_box_layout_pack (CLUTTER_BOX_LAYOUT (box_layout),
yellow,
FALSE, /* expand */
TRUE, /* x-fill */
FALSE, /* y-fill */
CLUTTER_BOX_ALIGNMENT_START, /* x-align */
CLUTTER_BOX_ALIGNMENT_START); /* y-align */
/* pack an actor into the box and set layout properties at the
* same time; note this is more concise if you mostly want to
* use the default properties for the layout
*/
red = clutter_rectangle_new_with_color (&red_color);
clutter_actor_set_size (red, 100, 100);
clutter_box_pack (CLUTTER_BOX (box),
red,
"x-fill", TRUE,
NULL);
/* add an actor to the box as a container and set layout properties
* afterwards; the latter is useful if you want to change properties on
* actors already inside a layout, but note that you have to
* pass the function both the layout AND the container
*/
blue = clutter_rectangle_new_with_color (&blue_color);
clutter_actor_set_size (blue, 100, 100);
clutter_container_add_actor (CLUTTER_CONTAINER (box), blue);
clutter_layout_manager_child_set (box_layout,
CLUTTER_CONTAINER (box),
blue,
"x-fill", TRUE,
NULL);
/* put the box on the stage */
clutter_container_add_actor (CLUTTER_CONTAINER (stage), box);
clutter_actor_show (stage);
clutter_main ();
return EXIT_SUCCESS;
}