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editor: Add support for cursor

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Add support for setting, moving and rendering a cursor.

Signed-off-by: Jan Arne Petersen <jpetersen@openismus.com>
This commit is contained in:
Jan Arne Petersen 2012-09-09 23:08:36 +02:00 committed by Kristian Høgsberg
parent b9eb02c46f
commit 7e634a0ea7
1 changed files with 100 additions and 0 deletions
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100
clients/editor.c
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@ -49,6 +49,7 @@ struct text_entry {
struct window *window;
char *text;
int active;
uint32_t cursor;
struct text_model *model;
struct text_layout *layout;
};
@ -136,6 +137,68 @@ text_layout_draw(struct text_layout *layout, cairo_t *cr)
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,
@ -248,6 +311,7 @@ text_entry_create(struct editor *editor, const char *text)
entry->window = editor->window;
entry->text = strdup(text);
entry->active = 0;
entry->cursor = strlen(text);
entry->model = text_model_factory_create_text_model(editor->text_model_factory);
text_model_add_listener(entry->model, &text_model_listener, entry);
@ -344,6 +408,30 @@ text_entry_deactivate(struct text_entry *entry,
seat);
}
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);
widget_schedule_redraw(entry->widget);
}
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, &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_redraw_handler(struct widget *widget, void *data)
{
@ -381,6 +469,9 @@ text_entry_redraw_handler(struct widget *widget, void *data)
cairo_translate(cr, 10, allocation.height / 2);
text_layout_draw(entry->layout, cr);
text_entry_draw_cursor(entry, cr);
cairo_pop_group_to_source(cr);
cairo_paint(cr);
@ -395,11 +486,20 @@ text_entry_button_handler(struct widget *widget,
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);