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editor: Extract text handling into text_layout

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Create a text_layout struct and functions for handling simple text
layouts.

Signed-off-by: Jan Arne Petersen <jpetersen@openismus.com>
This commit is contained in:
Jan Arne Petersen 2012-09-09 23:08:35 +02:00 committed by Kristian Høgsberg
parent f80bc06a8e
commit b9eb02c46f
1 changed files with 94 additions and 5 deletions
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99
clients/editor.c
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@ -32,12 +32,25 @@
#include "window.h"
#include "text-client-protocol.h"
static const char *font_name = "sans-serif";
static int font_size = 14;
struct text_layout {
cairo_glyph_t *glyphs;
int num_glyphs;
cairo_text_cluster_t *clusters;
int num_clusters;
cairo_text_cluster_flags_t cluster_flags;
cairo_scaled_font_t *font;
};
struct text_entry {
struct widget *widget;
struct window *window;
char *text;
int active;
struct text_model *model;
struct text_layout *layout;
};
struct editor {
@ -49,6 +62,81 @@ struct editor {
struct text_entry *editor;
};
static struct text_layout *
text_layout_create(void)
{
struct text_layout *layout;
cairo_surface_t *surface;
cairo_t *cr;
layout = malloc(sizeof *layout);
if (!layout)
return NULL;
layout->glyphs = NULL;
layout->num_glyphs = 0;
layout->clusters = NULL;
layout->num_clusters = 0;
surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 0, 0);
cr = cairo_create(surface);
cairo_set_font_size(cr, font_size);
cairo_select_font_face(cr, font_name, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
layout->font = cairo_get_scaled_font(cr);
cairo_scaled_font_reference(layout->font);
cairo_destroy(cr);
cairo_surface_destroy(surface);
return layout;
}
static void
text_layout_destroy(struct text_layout *layout)
{
if (layout->glyphs)
cairo_glyph_free(layout->glyphs);
if (layout->clusters)
cairo_text_cluster_free(layout->clusters);
cairo_scaled_font_destroy(layout->font);
free(layout);
}
static void
text_layout_set_text(struct text_layout *layout,
const char *text)
{
if (layout->glyphs)
cairo_glyph_free(layout->glyphs);
if (layout->clusters)
cairo_text_cluster_free(layout->clusters);
layout->glyphs = NULL;
layout->num_glyphs = 0;
layout->clusters = NULL;
layout->num_clusters = 0;
cairo_scaled_font_text_to_glyphs(layout->font, 0, 0, text, -1,
&layout->glyphs, &layout->num_glyphs,
&layout->clusters, &layout->num_clusters,
&layout->cluster_flags);
}
static void
text_layout_draw(struct text_layout *layout, cairo_t *cr)
{
cairo_save(cr);
cairo_set_scaled_font(cr, layout->font);
cairo_show_glyphs(cr, layout->glyphs, layout->num_glyphs);
cairo_restore(cr);
}
static void text_entry_redraw_handler(struct widget *widget, void *data);
static void text_entry_button_handler(struct widget *widget,
struct input *input, uint32_t time,
@ -60,6 +148,7 @@ text_entry_append(struct text_entry *entry, const char *text)
{
entry->text = realloc(entry->text, strlen(entry->text) + strlen(text) + 1);
strcat(entry->text, text);
text_layout_set_text(entry->layout, entry->text);
}
@ -162,6 +251,9 @@ text_entry_create(struct editor *editor, const char *text)
entry->model = text_model_factory_create_text_model(editor->text_model_factory);
text_model_add_listener(entry->model, &text_model_listener, entry);
entry->layout = text_layout_create();
text_layout_set_text(entry->layout, entry->text);
widget_set_redraw_handler(entry->widget, text_entry_redraw_handler);
widget_set_button_handler(entry->widget, text_entry_button_handler);
@ -173,6 +265,7 @@ text_entry_destroy(struct text_entry *entry)
{
widget_destroy(entry->widget);
text_model_destroy(entry->model);
text_layout_destroy(entry->layout);
free(entry->text);
free(entry);
}
@ -285,13 +378,9 @@ text_entry_redraw_handler(struct widget *widget, void *data)
}
cairo_set_source_rgba(cr, 0, 0, 0, 1);
cairo_select_font_face(cr, "sans",
CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_BOLD);
cairo_set_font_size(cr, 14);
cairo_translate(cr, 10, allocation.height / 2);
cairo_show_text(cr, entry->text);
text_layout_draw(entry->layout, cr);
cairo_pop_group_to_source(cr);
cairo_paint(cr);