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weston/clients/editor.c

835 lines
20 KiB

/*
* Copyright © 2012 Openismus GmbH
* Copyright © 2012 Intel Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of the copyright holders not be used in
* advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. The copyright holders make
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/input.h>
#include <cairo.h>
#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;
uint32_t cursor;
uint32_t anchor;
char *preedit_text;
uint32_t preedit_cursor;
struct text_model *model;
struct text_layout *layout;
};
struct editor {
struct text_model_factory *text_model_factory;
struct display *display;
struct window *window;
struct widget *widget;
struct text_entry *entry;
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_layout_extents(struct text_layout *layout, cairo_text_extents_t *extents)
{
cairo_scaled_font_glyph_extents(layout->font,
layout->glyphs, layout->num_glyphs,
extents);
}
static int
text_layout_xy_to_index(struct text_layout *layout, double x, double y)
{
cairo_text_extents_t extents;
int i;
cairo_scaled_font_glyph_extents(layout->font,
layout->glyphs, layout->num_glyphs,
&extents);
for (i = 1; i < layout->num_glyphs; i++) {
if (layout->glyphs[i].x >= x) {
return i - 1;
}
}
if (x >= layout->glyphs[layout->num_glyphs - 1].x && x < extents.width)
return layout->num_glyphs - 1;
return layout->num_glyphs;
}
static void
text_layout_index_to_pos(struct text_layout *layout, uint32_t index, cairo_rectangle_t *pos)
{
cairo_text_extents_t extents;
if (!pos)
return;
cairo_scaled_font_glyph_extents(layout->font,
layout->glyphs, layout->num_glyphs,
&extents);
if ((int)index >= layout->num_glyphs) {
pos->x = extents.x_advance;
pos->y = layout->num_glyphs ? layout->glyphs[layout->num_glyphs - 1].y : 0;
pos->width = 1;
pos->height = extents.height;
return;
}
pos->x = layout->glyphs[index].x;
pos->y = layout->glyphs[index].y;
pos->width = (int)index < layout->num_glyphs - 1 ? layout->glyphs[index + 1].x : extents.x_advance - pos->x;
pos->height = extents.height;
}
static void
text_layout_get_cursor_pos(struct text_layout *layout, int index, cairo_rectangle_t *pos)
{
text_layout_index_to_pos(layout, index, pos);
pos->width = 1;
}
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,
uint32_t button,
enum wl_pointer_button_state state, void *data);
static void text_entry_insert_at_cursor(struct text_entry *entry, const char *text);
static void text_entry_set_preedit(struct text_entry *entry,
const char *preedit_text,
int preedit_cursor);
static void text_entry_delete_text(struct text_entry *entry,
uint32_t index, uint32_t length);
static void
text_model_commit_string(void *data,
struct text_model *text_model,
const char *text,
uint32_t index)
{
struct text_entry *entry = data;
if (index > strlen(text)) {
fprintf(stderr, "Invalid cursor index %d\n", index);
index = strlen(text);
}
text_entry_insert_at_cursor(entry, text);
widget_schedule_redraw(entry->widget);
}
static void
text_model_preedit_string(void *data,
struct text_model *text_model,
const char *text,
uint32_t index)
{
struct text_entry *entry = data;
if (index > strlen(text)) {
fprintf(stderr, "Invalid cursor index %d\n", index);
index = strlen(text);
}
text_entry_set_preedit(entry, text, index);
widget_schedule_redraw(entry->widget);
}
static void
text_model_delete_surrounding_text(void *data,
struct text_model *text_model,
int32_t index,
uint32_t length)
{
struct text_entry *entry = data;
uint32_t cursor_index = index + entry->cursor;
if (cursor_index > strlen(entry->text)) {
fprintf(stderr, "Invalid cursor index %d\n", index);
return;
}
if (cursor_index + length > strlen(entry->text)) {
fprintf(stderr, "Invalid length %d\n", length);
return;
}
if (length == 0)
return;
text_entry_delete_text(entry, cursor_index, length);
}
static void
text_model_preedit_styling(void *data,
struct text_model *text_model)
{
}
static void
text_model_key(void *data,
struct text_model *text_model,
uint32_t key,
uint32_t state)
{
const char *state_label;
const char *key_label;
if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
state_label = "pressed";
} else {
state_label = "released";
}
switch (key) {
case XKB_KEY_Tab:
key_label = "Tab";
break;
case XKB_KEY_KP_Enter:
key_label = "Enter";
break;
default:
key_label = "Unknown";
}
fprintf(stderr, "%s key was %s.\n", key_label, state_label);
}
static void
text_model_selection_replacement(void *data,
struct text_model *text_model)
{
}
static void
text_model_direction(void *data,
struct text_model *text_model)
{
}
static void
text_model_locale(void *data,
struct text_model *text_model)
{
}
static void
text_model_activated(void *data,
struct text_model *text_model)
{
struct text_entry *entry = data;
entry->active = 1;
widget_schedule_redraw(entry->widget);
}
static void
text_model_deactivated(void *data,
struct text_model *text_model)
{
struct text_entry *entry = data;
entry->active = 0;
widget_schedule_redraw(entry->widget);
}
static const struct text_model_listener text_model_listener = {
text_model_commit_string,
text_model_preedit_string,
text_model_delete_surrounding_text,
text_model_preedit_styling,
text_model_key,
text_model_selection_replacement,
text_model_direction,
text_model_locale,
text_model_activated,
text_model_deactivated
};
static struct text_entry*
text_entry_create(struct editor *editor, const char *text)
{
struct text_entry *entry;
entry = malloc(sizeof *entry);
entry->widget = widget_add_widget(editor->widget, entry);
entry->window = editor->window;
entry->text = strdup(text);
entry->active = 0;
entry->cursor = strlen(text);
entry->anchor = entry->cursor;
entry->preedit_text = NULL;
entry->preedit_cursor = 0;
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);
return entry;
}
static void
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);
}
static void
redraw_handler(struct widget *widget, void *data)
{
struct editor *editor = data;
cairo_surface_t *surface;
struct rectangle allocation;
cairo_t *cr;
surface = window_get_surface(editor->window);
widget_get_allocation(editor->widget, &allocation);
cr = cairo_create(surface);
cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
cairo_clip(cr);
cairo_translate(cr, allocation.x, allocation.y);
/* Draw background */
cairo_push_group(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_rgba(cr, 1, 1, 1, 1);
cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
cairo_fill(cr);
cairo_pop_group_to_source(cr);
cairo_paint(cr);
cairo_destroy(cr);
cairo_surface_destroy(surface);
}
static void
text_entry_allocate(struct text_entry *entry, int32_t x, int32_t y,
int32_t width, int32_t height)
{
widget_set_allocation(entry->widget, x, y, width, height);
}
static void
resize_handler(struct widget *widget,
int32_t width, int32_t height, void *data)
{
struct editor *editor = data;
struct rectangle allocation;
widget_get_allocation(editor->widget, &allocation);
text_entry_allocate(editor->entry,
allocation.x + 20, allocation.y + 20,
width - 40, height / 2 - 40);
text_entry_allocate(editor->editor,
allocation.x + 20, allocation.y + height / 2 + 20,
width - 40, height / 2 - 40);
}
static void
text_entry_activate(struct text_entry *entry,
struct wl_seat *seat)
{
struct wl_surface *surface = window_get_wl_surface(entry->window);
text_model_activate(entry->model,
seat,
surface);
}
static void
text_entry_deactivate(struct text_entry *entry,
struct wl_seat *seat)
{
text_model_deactivate(entry->model,
seat);
}
static void
text_entry_update_layout(struct text_entry *entry)
{
char *text;
assert(((unsigned int)entry->cursor) <= strlen(entry->text));
if (!entry->preedit_text) {
text_layout_set_text(entry->layout, entry->text);
return;
}
text = malloc(strlen(entry->text) + strlen(entry->preedit_text) + 1);
strncpy(text, entry->text, entry->cursor);
strcpy(text + entry->cursor, entry->preedit_text);
strcpy(text + entry->cursor + strlen(entry->preedit_text),
entry->text + entry->cursor);
text_layout_set_text(entry->layout, text);
free(text);
widget_schedule_redraw(entry->widget);
text_model_set_surrounding_text(entry->model,
entry->text,
entry->cursor,
entry->anchor);
}
static void
text_entry_insert_at_cursor(struct text_entry *entry, const char *text)
{
char *new_text = malloc(strlen(entry->text) + strlen(text) + 1);
strncpy(new_text, entry->text, entry->cursor);
strcpy(new_text + entry->cursor, text);
strcpy(new_text + entry->cursor + strlen(text),
entry->text + entry->cursor);
free(entry->text);
entry->text = new_text;
entry->cursor += strlen(text);
entry->anchor += strlen(text);
text_entry_update_layout(entry);
}
static void
text_entry_set_preedit(struct text_entry *entry,
const char *preedit_text,
int preedit_cursor)
{
if (entry->preedit_text) {
free(entry->preedit_text);
entry->preedit_text = NULL;
entry->preedit_cursor = 0;
}
if (!preedit_text)
return;
entry->preedit_text = strdup(preedit_text);
entry->preedit_cursor = preedit_cursor;
text_entry_update_layout(entry);
}
static void
text_entry_set_cursor_position(struct text_entry *entry,
int32_t x, int32_t y)
{
entry->cursor = text_layout_xy_to_index(entry->layout, x, y);
if (entry->cursor >= entry->preedit_cursor) {
entry->cursor -= entry->preedit_cursor;
}
text_entry_update_layout(entry);
widget_schedule_redraw(entry->widget);
}
static void
text_entry_set_anchor_position(struct text_entry *entry,
int32_t x, int32_t y)
{
entry->anchor = text_layout_xy_to_index(entry->layout, x, y);
widget_schedule_redraw(entry->widget);
}
static void
text_entry_delete_text(struct text_entry *entry,
uint32_t index, uint32_t length)
{
if (entry->cursor > index)
entry->cursor -= length;
entry->text[index] = '\0';
strcat(entry->text, entry->text + index + length);
text_entry_update_layout(entry);
widget_schedule_redraw(entry->widget);
}
static void
text_entry_draw_selection(struct text_entry *entry, cairo_t *cr)
{
cairo_text_extents_t extents;
uint32_t start_index = entry->anchor < entry->cursor ? entry->anchor : entry->cursor;
uint32_t end_index = entry->anchor < entry->cursor ? entry->cursor : entry->anchor;
cairo_rectangle_t start;
cairo_rectangle_t end;
if (entry->anchor == entry->cursor)
return;
text_layout_extents(entry->layout, &extents);
text_layout_index_to_pos(entry->layout, start_index, &start);
text_layout_index_to_pos(entry->layout, end_index, &end);
cairo_save (cr);
cairo_set_source_rgba(cr, 0.0, 0.0, 1.0, 1.0);
cairo_rectangle(cr,
start.x, extents.y_bearing + extents.height + 2,
end.x - start.x, -extents.height - 4);
cairo_fill(cr);
cairo_rectangle(cr,
start.x, extents.y_bearing + extents.height,
end.x - start.x, -extents.height);
cairo_clip(cr);
cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0);
text_layout_draw(entry->layout, cr);
cairo_restore (cr);
}
static void
text_entry_draw_cursor(struct text_entry *entry, cairo_t *cr)
{
cairo_text_extents_t extents;
cairo_rectangle_t cursor_pos;
text_layout_extents(entry->layout, &extents);
text_layout_get_cursor_pos(entry->layout,
entry->cursor + entry->preedit_cursor,
&cursor_pos);
cairo_set_line_width(cr, 1.0);
cairo_move_to(cr, cursor_pos.x, extents.y_bearing + extents.height + 2);
cairo_line_to(cr, cursor_pos.x, extents.y_bearing - 2);
cairo_stroke(cr);
}
static void
text_entry_draw_preedit(struct text_entry *entry, cairo_t *cr)
{
cairo_text_extents_t extents;
cairo_rectangle_t start;
cairo_rectangle_t end;
if (!entry->preedit_text)
return;
text_layout_extents(entry->layout, &extents);
text_layout_index_to_pos(entry->layout, entry->cursor, &start);
text_layout_index_to_pos(entry->layout,
entry->cursor + strlen(entry->preedit_text),
&end);
cairo_save (cr);
cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
cairo_rectangle(cr,
start.x, 0,
end.x - start.x, 1);
cairo_fill(cr);
cairo_restore (cr);
}
static void
text_entry_redraw_handler(struct widget *widget, void *data)
{
struct text_entry *entry = data;
cairo_surface_t *surface;
struct rectangle allocation;
cairo_t *cr;
surface = window_get_surface(entry->window);
widget_get_allocation(entry->widget, &allocation);
cr = cairo_create(surface);
cairo_rectangle(cr, allocation.x, allocation.y, allocation.width, allocation.height);
cairo_clip(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_push_group(cr);
cairo_translate(cr, allocation.x, allocation.y);
cairo_set_source_rgba(cr, 1, 1, 1, 1);
cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
cairo_fill(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
if (entry->active) {
cairo_rectangle(cr, 0, 0, allocation.width, allocation.height);
cairo_set_line_width (cr, 3);
cairo_set_source_rgba(cr, 0, 0, 1, 1.0);
cairo_stroke(cr);
}
cairo_set_source_rgba(cr, 0, 0, 0, 1);
cairo_translate(cr, 10, allocation.height / 2);
text_layout_draw(entry->layout, cr);
text_entry_draw_selection(entry, cr);
text_entry_draw_cursor(entry, cr);
text_entry_draw_preedit(entry, cr);
cairo_pop_group_to_source(cr);
cairo_paint(cr);
cairo_destroy(cr);
cairo_surface_destroy(surface);
}
static int
text_entry_motion_handler(struct widget *widget,
struct input *input, uint32_t time,
float x, float y, void *data)
{
struct text_entry *entry = data;
struct rectangle allocation;
widget_get_allocation(entry->widget, &allocation);
text_entry_set_cursor_position(entry,
x - allocation.x,
y - allocation.y);
return CURSOR_IBEAM;
}
static void
text_entry_button_handler(struct widget *widget,
struct input *input, uint32_t time,
uint32_t button,
enum wl_pointer_button_state state, void *data)
{
struct text_entry *entry = data;
struct rectangle allocation;
int32_t x, y;
widget_get_allocation(entry->widget, &allocation);
input_get_position(input, &x, &y);
if (button != BTN_LEFT) {
return;
}
text_entry_set_cursor_position(entry,
x - allocation.x,
y - allocation.y);
if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
struct wl_seat *seat = input_get_seat(input);
text_entry_activate(entry, seat);
text_entry_set_anchor_position(entry,
x - allocation.x,
y - allocation.y);
widget_set_motion_handler(entry->widget, text_entry_motion_handler);
} else {
widget_set_motion_handler(entry->widget, NULL);
}
}
static void
editor_button_handler(struct widget *widget,
struct input *input, uint32_t time,
uint32_t button,
enum wl_pointer_button_state state, void *data)
{
struct editor *editor = data;
if (button != BTN_LEFT) {
return;
}
if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
struct wl_seat *seat = input_get_seat(input);
text_entry_deactivate(editor->entry, seat);
text_entry_deactivate(editor->editor, seat);
}
}
static void
global_handler(struct wl_display *display, uint32_t id,
const char *interface, uint32_t version, void *data)
{
struct editor *editor = data;
if (!strcmp(interface, "text_model_factory")) {
editor->text_model_factory = wl_display_bind(display, id,
&text_model_factory_interface);
}
}
int
main(int argc, char *argv[])
{
struct editor editor;
editor.display = display_create(argc, argv);
if (editor.display == NULL) {
fprintf(stderr, "failed to create display: %m\n");
return -1;
}
wl_display_add_global_listener(display_get_display(editor.display),
global_handler, &editor);
editor.window = window_create(editor.display);
editor.widget = frame_create(editor.window, &editor);
editor.entry = text_entry_create(&editor, "Entry");
editor.editor = text_entry_create(&editor, "Editor");
text_entry_set_preedit(editor.editor, "preedit", strlen("preedit"));
window_set_title(editor.window, "Text Editor");
widget_set_redraw_handler(editor.widget, redraw_handler);
widget_set_resize_handler(editor.widget, resize_handler);
widget_set_button_handler(editor.widget, editor_button_handler);
window_schedule_resize(editor.window, 500, 400);
display_run(editor.display);
text_entry_destroy(editor.entry);
text_entry_destroy(editor.editor);
return 0;
}