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gtk/demos/gtk-demo/foreigndrawing.c
Emmanuele Bassi 589cb19715 demos: Drop the '+' from GTK 
The demos have user-visible text that should refer to "GTK", not "GTK+"
any more.
2019-02-05 10:19:57 +01:00

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/* Foreign drawing
*
* Many applications can't use GTK widgets, for a variety of reasons,
* but still want their user interface to appear integrated with the
* rest of the desktop, and follow GTK themes. This demo shows how to
* use GtkStyleContext and the gtk_render_ APIs to achieve this.
*
* Note that this is a very simple, non-interactive example.
*/
#include <gtk/gtk.h>
#include <string.h>
static void
append_element (GtkWidgetPath *path,
const char *selector)
{
static const struct {
const char *name;
GtkStateFlags state_flag;
} pseudo_classes[] = {
{ "active", GTK_STATE_FLAG_ACTIVE },
{ "hover", GTK_STATE_FLAG_PRELIGHT },
{ "selected", GTK_STATE_FLAG_SELECTED },
{ "disabled", GTK_STATE_FLAG_INSENSITIVE },
{ "indeterminate", GTK_STATE_FLAG_INCONSISTENT },
{ "focus", GTK_STATE_FLAG_FOCUSED },
{ "backdrop", GTK_STATE_FLAG_BACKDROP },
{ "dir(ltr)", GTK_STATE_FLAG_DIR_LTR },
{ "dir(rtl)", GTK_STATE_FLAG_DIR_RTL },
{ "link", GTK_STATE_FLAG_LINK },
{ "visited", GTK_STATE_FLAG_VISITED },
{ "checked", GTK_STATE_FLAG_CHECKED },
{ "drop(active)", GTK_STATE_FLAG_DROP_ACTIVE }
};
const char *next;
char *name;
char type;
guint i;
next = strpbrk (selector, "#.:");
if (next == NULL)
next = selector + strlen (selector);
name = g_strndup (selector, next - selector);
if (g_ascii_isupper (selector[0]))
{
GType gtype;
gtype = g_type_from_name (name);
if (gtype == G_TYPE_INVALID)
{
g_critical ("Unknown type name `%s'", name);
g_free (name);
return;
}
gtk_widget_path_append_type (path, gtype);
}
else
{
/* Omit type, we're using name */
gtk_widget_path_append_type (path, G_TYPE_NONE);
gtk_widget_path_iter_set_object_name (path, -1, name);
}
g_free (name);
while (*next != '\0')
{
type = *next;
selector = next + 1;
next = strpbrk (selector, "#.:");
if (next == NULL)
next = selector + strlen (selector);
name = g_strndup (selector, next - selector);
switch (type)
{
case '#':
gtk_widget_path_iter_set_name (path, -1, name);
break;
case '.':
gtk_widget_path_iter_add_class (path, -1, name);
break;
case ':':
for (i = 0; i < G_N_ELEMENTS (pseudo_classes); i++)
{
if (g_str_equal (pseudo_classes[i].name, name))
{
gtk_widget_path_iter_set_state (path,
-1,
gtk_widget_path_iter_get_state (path, -1)
| pseudo_classes[i].state_flag);
break;
}
}
if (i == G_N_ELEMENTS (pseudo_classes))
g_critical ("Unknown pseudo-class :%s", name);
break;
default:
g_assert_not_reached ();
break;
}
g_free (name);
}
}
static GtkStyleContext *
create_context_for_path (GtkWidgetPath *path,
GtkStyleContext *parent)
{
GtkStyleContext *context;
context = gtk_style_context_new ();
gtk_style_context_set_path (context, path);
gtk_style_context_set_parent (context, parent);
/* Unfortunately, we have to explicitly set the state again here
* for it to take effect
*/
gtk_style_context_set_state (context, gtk_widget_path_iter_get_state (path, -1));
gtk_widget_path_unref (path);
return context;
}
static GtkStyleContext *
get_style (GtkStyleContext *parent,
const char *selector)
{
GtkWidgetPath *path;
if (parent)
path = gtk_widget_path_copy (gtk_style_context_get_path (parent));
else
path = gtk_widget_path_new ();
append_element (path, selector);
return create_context_for_path (path, parent);
}
static GtkStyleContext *
get_style_with_siblings (GtkStyleContext *parent,
const char *selector,
const char **siblings,
gint position)
{
GtkWidgetPath *path, *siblings_path;
guint i;
if (parent)
path = gtk_widget_path_copy (gtk_style_context_get_path (parent));
else
path = gtk_widget_path_new ();
siblings_path = gtk_widget_path_new ();
for (i = 0; siblings[i]; i++)
append_element (siblings_path, siblings[i]);
gtk_widget_path_append_with_siblings (path, siblings_path, position);
gtk_widget_path_unref (siblings_path);
return create_context_for_path (path, parent);
}
static void
draw_style_common (GtkStyleContext *context,
cairo_t *cr,
gint x,
gint y,
gint width,
gint height,
gint *contents_x,
gint *contents_y,
gint *contents_width,
gint *contents_height)
{
GtkBorder margin, border, padding;
int min_width, min_height;
gtk_style_context_get_margin (context, &margin);
gtk_style_context_get_border (context, &border);
gtk_style_context_get_padding (context, &padding);
gtk_style_context_get (context,
"min-width", &min_width,
"min-height", &min_height,
NULL);
x += margin.left;
y += margin.top;
width -= margin.left + margin.right;
height -= margin.top + margin.bottom;
width = MAX (width, min_width);
height = MAX (height, min_height);
gtk_render_background (context, cr, x, y, width, height);
gtk_render_frame (context, cr, x, y, width, height);
if (contents_x)
*contents_x = x + border.left + padding.left;
if (contents_y)
*contents_y = y + border.top + padding.top;
if (contents_width)
*contents_width = width - border.left - border.right - padding.left - padding.right;
if (contents_height)
*contents_height = height - border.top - border.bottom - padding.top - padding.bottom;
}
static void
query_size (GtkStyleContext *context,
gint *width,
gint *height)
{
GtkBorder margin, border, padding;
int min_width, min_height;
gtk_style_context_get_margin (context, &margin);
gtk_style_context_get_border (context, &border);
gtk_style_context_get_padding (context, &padding);
gtk_style_context_get (context,
"min-width", &min_width,
"min-height", &min_height,
NULL);
min_width += margin.left + margin.right + border.left + border.right + padding.left + padding.right;
min_height += margin.top + margin.bottom + border.top + border.bottom + padding.top + padding.bottom;
if (width)
*width = MAX (*width, min_width);
if (height)
*height = MAX (*height, min_height);
}
static void
draw_menu (GtkWidget *widget,
cairo_t *cr,
gint x,
gint y,
gint width,
gint *height)
{
GtkStyleContext *menu_context;
GtkStyleContext *menuitem_context;
GtkStyleContext *hovermenuitem_context;
GtkStyleContext *hoveredarrowmenuitem_context;
GtkStyleContext *arrowmenuitem_context;
GtkStyleContext *checkmenuitem_context;
GtkStyleContext *disabledarrowmenuitem_context;
GtkStyleContext *disabledcheckmenuitem_context;
GtkStyleContext *radiomenuitem_context;
GtkStyleContext *disablemenuitem_context;
GtkStyleContext *disabledradiomenuitem_context;
GtkStyleContext *separatormenuitem_context;
gint menuitem1_height, menuitem2_height, menuitem3_height, menuitem4_height, menuitem5_height;
gint contents_x, contents_y, contents_width, contents_height;
gint menu_x, menu_y, menu_width, menu_height;
gint arrow_width, arrow_height, arrow_size;
gint toggle_x, toggle_y, toggle_width, toggle_height;
/* This information is taken from the GtkMenu docs, see "CSS nodes" */
menu_context = get_style (gtk_widget_get_style_context(widget), "menu");
hovermenuitem_context = get_style (menu_context, "menuitem:hover");
hoveredarrowmenuitem_context = get_style (hovermenuitem_context, "arrow.right:dir(ltr)");
menuitem_context = get_style (menu_context, "menuitem");
arrowmenuitem_context = get_style (menuitem_context, "arrow:dir(rtl)");
disablemenuitem_context = get_style (menu_context, "menuitem:disabled");
disabledarrowmenuitem_context = get_style (disablemenuitem_context, "arrow:dir(rtl)");
checkmenuitem_context = get_style (menuitem_context, "check:checked");
disabledcheckmenuitem_context = get_style (disablemenuitem_context, "check");
separatormenuitem_context = get_style (menu_context, "separator:disabled");
radiomenuitem_context = get_style (menuitem_context, "radio:checked");
disabledradiomenuitem_context = get_style (disablemenuitem_context, "radio");
*height = 0;
query_size (menu_context, NULL, height);
menuitem1_height = 0;
query_size (hovermenuitem_context, NULL, &menuitem1_height);
query_size (hoveredarrowmenuitem_context, NULL, &menuitem1_height);
*height += menuitem1_height;
menuitem2_height = 0;
query_size (menu_context, NULL, &menuitem5_height);
query_size (menuitem_context, NULL, &menuitem2_height);
query_size (arrowmenuitem_context, NULL, &menuitem2_height);
query_size (disabledarrowmenuitem_context, NULL, &menuitem2_height);
*height += menuitem2_height;
menuitem3_height = 0;
query_size (menu_context, NULL, &menuitem5_height);
query_size (menuitem_context, NULL, &menuitem3_height);
query_size (checkmenuitem_context, NULL, &menuitem3_height);
query_size (disabledcheckmenuitem_context, NULL, &menuitem3_height);
*height += menuitem3_height;
menuitem4_height = 0;
query_size (menu_context, NULL, &menuitem5_height);
query_size (separatormenuitem_context, NULL, &menuitem4_height);
*height += menuitem4_height;
menuitem5_height = 0;
query_size (menu_context, NULL, &menuitem5_height);
query_size (menuitem_context, NULL, &menuitem5_height);
query_size (radiomenuitem_context, NULL, &menuitem5_height);
query_size (disabledradiomenuitem_context, NULL, &menuitem5_height);
*height += menuitem5_height;
draw_style_common (menu_context, cr, x, y, width, *height,
&menu_x, &menu_y, &menu_width, &menu_height);
/* Hovered with right arrow */
gtk_style_context_get (hoveredarrowmenuitem_context,
"min-width", &arrow_width, "min-height", &arrow_height, NULL);
arrow_size = MIN (arrow_width, arrow_height);
draw_style_common (hovermenuitem_context, cr, menu_x, menu_y, menu_width, menuitem1_height,
&contents_x, &contents_y, &contents_width, &contents_height);
gtk_render_arrow (hoveredarrowmenuitem_context, cr, G_PI / 2,
contents_x + contents_width - arrow_size,
contents_y + (contents_height - arrow_size) / 2, arrow_size);
/* Left arrow sensitive, and right arrow insensitive */
draw_style_common (menuitem_context, cr, menu_x, menu_y + menuitem1_height, menu_width, menuitem2_height,
&contents_x, &contents_y, &contents_width, &contents_height);
gtk_style_context_get (arrowmenuitem_context,
"min-width", &arrow_width, "min-height", &arrow_height, NULL);
arrow_size = MIN (arrow_width, arrow_height);
gtk_render_arrow (arrowmenuitem_context, cr, G_PI / 2,
contents_x,
contents_y + (contents_height - arrow_size) / 2, arrow_size);
gtk_style_context_get (disabledarrowmenuitem_context,
"min-width", &arrow_width, "min-height", &arrow_height, NULL);
arrow_size = MIN (arrow_width, arrow_height);
gtk_render_arrow (disabledarrowmenuitem_context, cr, G_PI / 2,
contents_x + contents_width - arrow_size,
contents_y + (contents_height - arrow_size) / 2, arrow_size);
/* Left check enabled, sensitive, and right check unchecked, insensitive */
draw_style_common (menuitem_context, cr, menu_x, menu_y + menuitem1_height + menuitem2_height, menu_width, menuitem3_height,
&contents_x, &contents_y, &contents_width, &contents_height);
gtk_style_context_get (checkmenuitem_context,
"min-width", &toggle_width, "min-height", &toggle_height, NULL);
draw_style_common (checkmenuitem_context, cr,
contents_x,
contents_y,
toggle_width, toggle_height,
&toggle_x, &toggle_y, &toggle_width, &toggle_height);
gtk_render_check (checkmenuitem_context, cr, toggle_x, toggle_y, toggle_width, toggle_height);
gtk_style_context_get (disabledcheckmenuitem_context,
"min-width", &toggle_width, "min-height", &toggle_height, NULL);
draw_style_common (disabledcheckmenuitem_context, cr,
contents_x + contents_width - toggle_width,
contents_y,
toggle_width, toggle_height,
&toggle_x, &toggle_y, &toggle_width, &toggle_height);
gtk_render_check (disabledcheckmenuitem_context, cr, toggle_x, toggle_y, toggle_width, toggle_height);
/* Separator */
draw_style_common (separatormenuitem_context, cr, menu_x, menu_y + menuitem1_height + menuitem2_height + menuitem3_height,
menu_width, menuitem4_height,
NULL, NULL, NULL, NULL);
/* Left check enabled, sensitive, and right check unchecked, insensitive */
draw_style_common (menuitem_context, cr, menu_x, menu_y + menuitem1_height + menuitem2_height + menuitem3_height + menuitem4_height,
menu_width, menuitem5_height,
&contents_x, &contents_y, &contents_width, &contents_height);
gtk_style_context_get (radiomenuitem_context,
"min-width", &toggle_width, "min-height", &toggle_height, NULL);
draw_style_common (radiomenuitem_context, cr,
contents_x,
contents_y,
toggle_width, toggle_height,
&toggle_x, &toggle_y, &toggle_width, &toggle_height);
gtk_render_check (radiomenuitem_context, cr, toggle_x, toggle_y, toggle_width, toggle_height);
gtk_style_context_get (disabledradiomenuitem_context,
"min-width", &toggle_width, "min-height", &toggle_height, NULL);
draw_style_common (disabledradiomenuitem_context, cr,
contents_x + contents_width - toggle_width,
contents_y,
toggle_width, toggle_height,
&toggle_x, &toggle_y, &toggle_width, &toggle_height);
gtk_render_check (disabledradiomenuitem_context, cr, toggle_x, toggle_y, toggle_width, toggle_height);
g_object_unref (menu_context);
g_object_unref (menuitem_context);
g_object_unref (hovermenuitem_context);
g_object_unref (hoveredarrowmenuitem_context);
g_object_unref (arrowmenuitem_context);
g_object_unref (checkmenuitem_context);
g_object_unref (disabledarrowmenuitem_context);
g_object_unref (disabledcheckmenuitem_context);
g_object_unref (radiomenuitem_context);
g_object_unref (disablemenuitem_context);
g_object_unref (disabledradiomenuitem_context);
g_object_unref (separatormenuitem_context);
}
static void
draw_menubar (GtkWidget *widget,
cairo_t *cr,
gint x,
gint y,
gint width,
gint *height)
{
GtkStyleContext *frame_context;
GtkStyleContext *border_context;
GtkStyleContext *menubar_context;
GtkStyleContext *hovered_menuitem_context;
GtkStyleContext *menuitem_context;
gint contents_x, contents_y, contents_width, contents_height;
gint item_width;
/* Menubar background is the same color as our base background, so use a frame */
frame_context = get_style (NULL, "frame");
border_context = get_style (frame_context, "border");
/* This information is taken from the GtkMenuBar docs, see "CSS nodes" */
menubar_context = get_style (NULL, "menubar");
hovered_menuitem_context = get_style (menubar_context, "menuitem:hover");
menuitem_context = get_style (menubar_context, "menuitem");
*height = 0;
query_size (frame_context, NULL, height);
query_size (border_context, NULL, height);
query_size (menubar_context, NULL, height);
query_size (hovered_menuitem_context, NULL, height);
query_size (menuitem_context, NULL, height);
draw_style_common (frame_context, cr, x, y, width, *height,
NULL, NULL, NULL, NULL);
draw_style_common (border_context, cr, x, y, width, *height,
&contents_x, &contents_y, &contents_width, &contents_height);
draw_style_common (menubar_context, cr, contents_x, contents_y, contents_width, contents_height,
NULL, NULL, NULL, NULL);
item_width = contents_width / 3;
draw_style_common (hovered_menuitem_context, cr, contents_x, contents_y, item_width, contents_height,
NULL, NULL, NULL, NULL);
draw_style_common (menuitem_context, cr, contents_x + item_width * 2, contents_y, item_width, contents_height,
NULL, NULL, NULL, NULL);
g_object_unref (menuitem_context);
g_object_unref (hovered_menuitem_context);
g_object_unref (menubar_context);
g_object_unref (border_context);
g_object_unref (frame_context);
}
static void
draw_notebook (GtkWidget *widget,
cairo_t *cr,
gint x,
gint y,
gint width,
gint height)
{
GtkStyleContext *notebook_context;
GtkStyleContext *header_context;
GtkStyleContext *tabs_context;
GtkStyleContext *tab1_context, *tab2_context;
GtkStyleContext *stack_context;
gint header_height;
gint contents_x, contents_y, contents_width, contents_height;
/* This information is taken from the GtkNotebook docs, see "CSS nodes" */
notebook_context = get_style (NULL, "notebook.frame");
header_context = get_style (notebook_context, "header.top");
tabs_context = get_style (header_context, "tabs");
tab1_context = get_style (tabs_context, "tab:checked");
tab2_context = get_style (tabs_context, "tab:hover");
stack_context = get_style (notebook_context, "stack");
header_height = 0;
query_size (notebook_context, NULL, &header_height);
query_size (header_context, NULL, &header_height);
query_size (tabs_context, NULL, &header_height);
query_size (tab1_context, NULL, &header_height);
query_size (tab2_context, NULL, &header_height);
draw_style_common (notebook_context, cr, x, y, width, height, NULL, NULL, NULL, NULL);
draw_style_common (header_context, cr, x, y, width, header_height, NULL, NULL, NULL, NULL);
draw_style_common (tabs_context, cr, x, y, width, header_height, NULL, NULL, NULL, NULL);
draw_style_common (tab1_context, cr, x, y, width / 2, header_height,
&contents_x, &contents_y, &contents_width, &contents_height);
draw_style_common (tab2_context, cr, x + width / 2, y, width / 2, header_height,
NULL, NULL, NULL, NULL);
draw_style_common (stack_context, cr, x, y + header_height, width,height - header_height,
NULL, NULL, NULL, NULL);
g_object_unref (stack_context);
g_object_unref (tabs_context);
g_object_unref (tab1_context);
g_object_unref (tab2_context);
g_object_unref (header_context);
g_object_unref (notebook_context);
}
static void
draw_horizontal_scrollbar (GtkWidget *widget,
cairo_t *cr,
gint x,
gint y,
gint width,
gint position,
GtkStateFlags state,
gint *height)
{
GtkStyleContext *scrollbar_context;
GtkStyleContext *contents_context;
GtkStyleContext *trough_context;
GtkStyleContext *slider_context;
gint slider_width;
/* This information is taken from the GtkScrollbar docs, see "CSS nodes" */
scrollbar_context = get_style (NULL, "scrollbar.horizontal.bottom");
contents_context = get_style (scrollbar_context, "contents");
trough_context = get_style (contents_context, "trough");
slider_context = get_style (trough_context, "slider");
gtk_style_context_set_state (scrollbar_context, state);
gtk_style_context_set_state (contents_context, state);
gtk_style_context_set_state (trough_context, state);
gtk_style_context_set_state (slider_context, state);
*height = 0;
query_size (scrollbar_context, NULL, height);
query_size (contents_context, NULL, height);
query_size (trough_context, NULL, height);
query_size (slider_context, NULL, height);
gtk_style_context_get (slider_context,
"min-width", &slider_width, NULL);
draw_style_common (scrollbar_context, cr, x, y, width, *height, NULL, NULL, NULL, NULL);
draw_style_common (contents_context, cr, x, y, width, *height, NULL, NULL, NULL, NULL);
draw_style_common (trough_context, cr, x, y, width, *height, NULL, NULL, NULL, NULL);
draw_style_common (slider_context, cr, x + position, y, slider_width, *height, NULL, NULL, NULL, NULL);
g_object_unref (slider_context);
g_object_unref (trough_context);
g_object_unref (contents_context);
g_object_unref (scrollbar_context);
}
static void
draw_text (GtkWidget *widget,
cairo_t *cr,
gint x,
gint y,
gint width,
gint height,
const gchar *text,
GtkStateFlags state)
{
GtkStyleContext *label_context;
GtkStyleContext *selection_context;
GtkStyleContext *context;
PangoLayout *layout;
/* This information is taken from the GtkLabel docs, see "CSS nodes" */
label_context = get_style (NULL, "label.view");
selection_context = get_style (label_context, "selection");
gtk_style_context_set_state (label_context, state);
if (state & GTK_STATE_FLAG_SELECTED)
context = selection_context;
else
context = label_context;
layout = gtk_widget_create_pango_layout (widget, text);
gtk_render_background (context, cr, x, y, width, height);
gtk_render_frame (context, cr, x, y, width, height);
gtk_render_layout (context, cr, x, y, layout);
g_object_unref (layout);
g_object_unref (selection_context);
g_object_unref (label_context);
}
static void
draw_check (GtkWidget *widget,
cairo_t *cr,
gint x,
gint y,
GtkStateFlags state,
gint *width,
gint *height)
{
GtkStyleContext *button_context;
GtkStyleContext *check_context;
gint contents_x, contents_y, contents_width, contents_height;
/* This information is taken from the GtkCheckButton docs, see "CSS nodes" */
button_context = get_style (NULL, "checkbutton");
check_context = get_style (button_context, "check");
gtk_style_context_set_state (check_context, state);
*width = *height = 0;
query_size (button_context, width, height);
query_size (check_context, width, height);
draw_style_common (button_context, cr, x, y, *width, *height, NULL, NULL, NULL, NULL);
draw_style_common (check_context, cr, x, y, *width, *height,
&contents_x, &contents_y, &contents_width, &contents_height);
gtk_render_check (check_context, cr, contents_x, contents_y, contents_width, contents_height);
g_object_unref (check_context);
g_object_unref (button_context);
}
static void
draw_radio (GtkWidget *widget,
cairo_t *cr,
gint x,
gint y,
GtkStateFlags state,
gint *width,
gint *height)
{
GtkStyleContext *button_context;
GtkStyleContext *check_context;
gint contents_x, contents_y, contents_width, contents_height;
/* This information is taken from the GtkRadioButton docs, see "CSS nodes" */
button_context = get_style (NULL, "radiobutton");
check_context = get_style (button_context, "radio");
gtk_style_context_set_state (check_context, state);
*width = *height = 0;
query_size (button_context, width, height);
query_size (check_context, width, height);
draw_style_common (button_context, cr, x, y, *width, *height, NULL, NULL, NULL, NULL);
draw_style_common (check_context, cr, x, y, *width, *height,
&contents_x, &contents_y, &contents_width, &contents_height);
gtk_render_check (check_context, cr, contents_x, contents_y, contents_width, contents_height);
g_object_unref (check_context);
g_object_unref (button_context);
}
static void
draw_progress (GtkWidget *widget,
cairo_t *cr,
gint x,
gint y,
gint width,
gint position,
gint *height)
{
GtkStyleContext *bar_context;
GtkStyleContext *trough_context;
GtkStyleContext *progress_context;
/* This information is taken from the GtkProgressBar docs, see "CSS nodes" */
bar_context = get_style (NULL, "progressbar.horizontal");
trough_context = get_style (bar_context, "trough");
progress_context = get_style (trough_context, "progress.left");
*height = 0;
query_size (bar_context, NULL, height);
query_size (trough_context, NULL, height);
query_size (progress_context, NULL, height);
draw_style_common (bar_context, cr, x, y, width, *height, NULL, NULL, NULL, NULL);
draw_style_common (trough_context, cr, x, y, width, *height, NULL, NULL, NULL, NULL);
draw_style_common (progress_context, cr, x, y, position, *height, NULL, NULL, NULL, NULL);
g_object_unref (progress_context);
g_object_unref (trough_context);
g_object_unref (bar_context);
}
static void
draw_scale (GtkWidget *widget,
cairo_t *cr,
gint x,
gint y,
gint width,
gint position,
gint *height)
{
GtkStyleContext *scale_context;
GtkStyleContext *contents_context;
GtkStyleContext *trough_context;
GtkStyleContext *slider_context;
GtkStyleContext *highlight_context;
gint contents_x, contents_y, contents_width, contents_height;
gint trough_height, slider_height;
scale_context = get_style (NULL, "scale.horizontal");
contents_context = get_style (scale_context, "contents");
trough_context = get_style (contents_context, "trough");
slider_context = get_style (trough_context, "slider");
highlight_context = get_style (trough_context, "highlight.top");
*height = 0;
query_size (scale_context, NULL, height);
query_size (contents_context, NULL, height);
query_size (trough_context, NULL, height);
query_size (slider_context, NULL, height);
query_size (highlight_context, NULL, height);
draw_style_common (scale_context, cr, x, y, width, *height,
&contents_x, &contents_y, &contents_width, &contents_height);
draw_style_common (contents_context, cr, contents_x, contents_y, contents_width, contents_height,
&contents_x, &contents_y, &contents_width, &contents_height);
/* Scale trough defines its size querying slider and highlight */
trough_height = 0;
query_size (trough_context, NULL, &trough_height);
slider_height = 0;
query_size (slider_context, NULL, &slider_height);
query_size (highlight_context, NULL, &slider_height);
trough_height += slider_height;
draw_style_common (trough_context, cr, contents_x, contents_y, contents_width, trough_height,
&contents_x, &contents_y, &contents_width, &contents_height);
draw_style_common (highlight_context, cr, contents_x, contents_y,
contents_width / 2, contents_height,
NULL, NULL, NULL, NULL);
draw_style_common (slider_context, cr, contents_x + position, contents_y, contents_height, contents_height,
NULL, NULL, NULL, NULL);
g_object_unref (scale_context);
g_object_unref (contents_context);
g_object_unref (trough_context);
g_object_unref (slider_context);
g_object_unref (highlight_context);
}
static void
draw_combobox (GtkWidget *widget,
cairo_t *cr,
gint x,
gint y,
gint width,
gboolean has_entry,
gint *height)
{
GtkStyleContext *combo_context;
GtkStyleContext *box_context;
GtkStyleContext *button_context;
GtkStyleContext *button_box_context;
GtkStyleContext *entry_context;
GtkStyleContext *arrow_context;
gint contents_x, contents_y, contents_width, contents_height;
gint button_width;
gint arrow_width, arrow_height, arrow_size;
/* This information is taken from the GtkComboBox docs, see "CSS nodes" */
combo_context = get_style (NULL, "combobox:focus");
box_context = get_style (combo_context, "box.horizontal.linked");
if (has_entry)
{
const char *siblings[3] = { "entry.combo:focus", "button.combo" , NULL };
entry_context = get_style_with_siblings (box_context, "entry.combo:focus", siblings, 0);
button_context = get_style_with_siblings (box_context, "button.combo", siblings, 1);
}
else
{
const char *siblings[2] = { "button.combo" , NULL };
button_context = get_style_with_siblings (box_context, "button.combo", siblings, 0);
}
button_box_context = get_style (button_context, "box.horizontal");
arrow_context = get_style (button_box_context, "arrow");
*height = 0;
query_size (combo_context, NULL, height);
query_size (box_context, NULL, height);
if (has_entry)
query_size (entry_context, NULL, height);
query_size (button_context, NULL, height);
query_size (button_box_context, NULL, height);
query_size (arrow_context, NULL, height);
gtk_style_context_get (arrow_context,
"min-width", &arrow_width, "min-height", &arrow_height, NULL);
arrow_size = MIN (arrow_width, arrow_height);
draw_style_common (combo_context, cr, x, y, width, *height, NULL, NULL, NULL, NULL);
draw_style_common (box_context, cr, x, y, width, *height, NULL, NULL, NULL, NULL);
if (has_entry)
{
button_width = *height;
draw_style_common (entry_context, cr, x, y, width - button_width, *height, NULL, NULL, NULL, NULL);
draw_style_common (button_context, cr, x + width - button_width, y, button_width, *height,
&contents_x, &contents_y, &contents_width, &contents_height);
}
else
{
button_width = width;
draw_style_common (button_context, cr, x, y, width, *height,
&contents_x, &contents_y, &contents_width, &contents_height);
}
draw_style_common (button_box_context, cr, contents_x, contents_y, contents_width, contents_height,
NULL, NULL, NULL, NULL);
draw_style_common (arrow_context, cr, contents_x, contents_y, contents_width, contents_height,
NULL, NULL, NULL, NULL);
gtk_render_arrow (arrow_context, cr, G_PI / 2,
contents_x + contents_width - arrow_size,
contents_y + (contents_height - arrow_size) / 2, arrow_size);
g_object_unref (arrow_context);
if (has_entry)
g_object_unref (entry_context);
g_object_unref (button_context);
g_object_unref (combo_context);
}
static void
draw_spinbutton (GtkWidget *widget,
cairo_t *cr,
gint x,
gint y,
gint width,
gint *height)
{
GtkStyleContext *spin_context;
GtkStyleContext *entry_context;
GtkStyleContext *up_context;
GtkStyleContext *down_context;
GtkIconTheme *icon_theme;
GtkIconInfo *icon_info;
GdkPixbuf *pixbuf;
GdkTexture *texture;
gint icon_width, icon_height, icon_size;
gint button_width;
gint contents_x, contents_y, contents_width, contents_height;
/* This information is taken from the GtkSpinButton docs, see "CSS nodes" */
spin_context = get_style (NULL, "spinbutton.horizontal:focus");
entry_context = get_style (spin_context, "entry:focus");
up_context = get_style (spin_context, "button.up:focus:active");
down_context = get_style (spin_context, "button.down:focus");
*height = 0;
query_size (spin_context, NULL, height);
query_size (entry_context, NULL, height);
query_size (up_context, NULL, height);
query_size (down_context, NULL, height);
button_width = *height;
draw_style_common (spin_context, cr, x, y, width, *height, NULL, NULL, NULL, NULL);
draw_style_common (entry_context, cr, x, y, width, *height, NULL, NULL, NULL, NULL);
icon_theme = gtk_icon_theme_get_for_display (gtk_widget_get_display (widget));
gtk_style_context_get (up_context,
"min-width", &icon_width, "min-height", &icon_height, NULL);
icon_size = MIN (icon_width, icon_height);
icon_info = gtk_icon_theme_lookup_icon (icon_theme, "list-add-symbolic", icon_size, 0);
pixbuf = gtk_icon_info_load_symbolic_for_context (icon_info, up_context, NULL, NULL);
texture = gdk_texture_new_for_pixbuf (pixbuf);
g_object_unref (icon_info);
draw_style_common (up_context, cr, x + width - button_width, y, button_width, *height,
&contents_x, &contents_y, &contents_width, &contents_height);
gtk_render_icon (up_context, cr, texture, contents_x, contents_y + (contents_height - icon_size) / 2);
g_object_unref (pixbuf);
g_object_unref (texture);
gtk_style_context_get (down_context,
"min-width", &icon_width, "min-height", &icon_height, NULL);
icon_size = MIN (icon_width, icon_height);
icon_info = gtk_icon_theme_lookup_icon (icon_theme, "list-remove-symbolic", icon_size, 0);
pixbuf = gtk_icon_info_load_symbolic_for_context (icon_info, down_context, NULL, NULL);
texture = gdk_texture_new_for_pixbuf (pixbuf);
g_object_unref (icon_info);
draw_style_common (down_context, cr, x + width - 2 * button_width, y, button_width, *height,
&contents_x, &contents_y, &contents_width, &contents_height);
gtk_render_icon (down_context, cr, texture, contents_x, contents_y + (contents_height - icon_size) / 2);
g_object_unref (pixbuf);
g_object_unref (texture);
g_object_unref (down_context);
g_object_unref (up_context);
g_object_unref (entry_context);
g_object_unref (spin_context);
}
static void
draw_func (GtkDrawingArea *da,
cairo_t *cr,
int width,
int height,
gpointer data)
{
GtkWidget *widget = GTK_WIDGET (da);
gint panewidth;
gint x, y;
panewidth = width / 2;
cairo_rectangle (cr, 0, 0, width, height);
cairo_set_source_rgb (cr, 0.9, 0.9, 0.9);
cairo_fill (cr);
x = y = 10;
draw_horizontal_scrollbar (widget, cr, x, y, panewidth - 20, 30, GTK_STATE_FLAG_NORMAL, &height);
y += height + 8;
draw_horizontal_scrollbar (widget, cr, x, y, panewidth - 20, 40, GTK_STATE_FLAG_PRELIGHT, &height);
y += height + 8;
draw_horizontal_scrollbar (widget, cr, x, y, panewidth - 20, 50, GTK_STATE_FLAG_ACTIVE|GTK_STATE_FLAG_PRELIGHT, &height);
y += height + 8;
draw_text (widget, cr, x, y, panewidth - 20, 20, "Not selected", GTK_STATE_FLAG_NORMAL);
y += 20 + 10;
draw_text (widget, cr, x, y, panewidth - 20, 20, "Selected", GTK_STATE_FLAG_SELECTED);
x = 10;
y += 20 + 10;
draw_check (widget, cr, x, y, GTK_STATE_FLAG_NORMAL, &width, &height);
x += width + 10;
draw_check (widget, cr, x, y, GTK_STATE_FLAG_CHECKED, &width, &height);
x += width + 10;
draw_radio (widget, cr, x, y, GTK_STATE_FLAG_NORMAL, &width, &height);
x += width + 10;
draw_radio (widget, cr, x, y, GTK_STATE_FLAG_CHECKED, &width, &height);
x = 10;
y += height + 10;
draw_progress (widget, cr, x, y, panewidth - 20, 50, &height);
y += height + 10;
draw_scale (widget, cr, x, y, panewidth - 20, 75, &height);
y += height + 20;
draw_notebook (widget, cr, x, y, panewidth - 20, 160);
/* Second column */
x += panewidth;
y = 10;
draw_menu (widget, cr, x, y, panewidth - 20, &height);
y += height + 10;
draw_menubar (widget, cr, x, y, panewidth - 20, &height);
y += height + 20;
draw_spinbutton (widget, cr, x, y, panewidth - 20, &height);
y += height + 30;
draw_combobox (widget, cr, x, y, panewidth - 20, FALSE, &height);
y += height + 10;
draw_combobox (widget, cr, 10 + panewidth, y, panewidth - 20, TRUE, &height);
}
GtkWidget *
do_foreigndrawing (GtkWidget *do_widget)
{
static GtkWidget *window = NULL;
if (!window)
{
GtkWidget *box;
GtkWidget *da;
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "Foreign drawing");
gtk_window_set_display (GTK_WINDOW (window),
gtk_widget_get_display (do_widget));
g_signal_connect (window, "destroy",
G_CALLBACK (gtk_widget_destroyed), &window);
box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
gtk_container_add (GTK_CONTAINER (window), box);
da = gtk_drawing_area_new ();
gtk_drawing_area_set_content_width (GTK_DRAWING_AREA (da), 400);
gtk_drawing_area_set_content_height (GTK_DRAWING_AREA (da), 400);
gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (da), draw_func, NULL, NULL);
gtk_widget_set_hexpand (da, TRUE);
gtk_widget_set_vexpand (da, TRUE);
gtk_container_add (GTK_CONTAINER (box), da);
}
if (!gtk_widget_get_visible (window))
gtk_widget_show (window);
else
gtk_widget_destroy (window);
return window;
}
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