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Diffstat (limited to 'gtk/gtktextdisplay.c')
| -rw-r--r-- | gtk/gtktextdisplay.c | 609 |
1 files changed, 609 insertions, 0 deletions
diff --git a/gtk/gtktextdisplay.c b/gtk/gtktextdisplay.c new file mode 100644 index 000000000..a6c1ac261 --- /dev/null +++ b/gtk/gtktextdisplay.c @@ -0,0 +1,609 @@ +/* gtktextdisplay.c - display layed-out text + * + * Copyright (c) 1992-1994 The Regents of the University of California. + * Copyright (c) 1994-1997 Sun Microsystems, Inc. + * Copyright (c) 2000 Red Hat, Inc. + * Tk->Gtk port by Havoc Pennington + * + * + * This software is copyrighted by the Regents of the University of + * California, Sun Microsystems, Inc., and other parties. The + * following terms apply to all files associated with the software + * unless explicitly disclaimed in individual files. + * + * The authors hereby grant permission to use, copy, modify, + * distribute, and license this software and its documentation for any + * purpose, provided that existing copyright notices are retained in + * all copies and that this notice is included verbatim in any + * distributions. No written agreement, license, or royalty fee is + * required for any of the authorized uses. Modifications to this + * software may be copyrighted by their authors and need not follow + * the licensing terms described here, provided that the new terms are + * clearly indicated on the first page of each file where they apply. + * + * IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY + * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL + * DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, + * OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * + * THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES, + * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND + * NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, + * AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE + * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. + * + * GOVERNMENT USE: If you are acquiring this software on behalf of the + * U.S. government, the Government shall have only "Restricted Rights" + * in the software and related documentation as defined in the Federal + * Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you + * are acquiring the software on behalf of the Department of Defense, + * the software shall be classified as "Commercial Computer Software" + * and the Government shall have only "Restricted Rights" as defined + * in Clause 252.227-7013 (c) (1) of DFARs. Notwithstanding the + * foregoing, the authors grant the U.S. Government and others acting + * in its behalf permission to use and distribute the software in + * accordance with the terms specified in this license. + * + */ + +#include "gtktextdisplay.h" +#include "gtktextiterprivate.h" +#include <pango/pangox.h> +#include "x11/gdkx.h" + +typedef struct _GtkTextRenderState GtkTextRenderState; + +struct _GtkTextRenderState +{ + GtkWidget *widget; + + GtkTextAppearance *last_appearance; + GdkGC *fg_gc; + GdkGC *bg_gc; + GdkRectangle clip_rect; +}; + +static void get_item_properties (PangoItem *item, + GtkTextAppearance **appearance); +static GdkRegion *get_selected_clip (GtkTextRenderState *render_state, + PangoLayout *layout, + PangoLayoutLine *line, + int x, + int y, + int height, + int start_index, + int end_index); + +static GtkTextRenderState * +gtk_text_render_state_new (GtkWidget *widget, + GdkDrawable *drawable, + GdkRectangle *clip_rect) +{ + GtkTextRenderState *state = g_new0 (GtkTextRenderState, 1); + + state->widget = widget; + state->fg_gc = gdk_gc_new (drawable); + state->bg_gc = gdk_gc_new (drawable); + state->clip_rect = *clip_rect; + + return state; +} + +static void +gtk_text_render_state_destroy (GtkTextRenderState *state) +{ + gdk_gc_unref (state->fg_gc); + gdk_gc_unref (state->bg_gc); + + g_free (state); +} + +static void +gtk_text_render_state_set_color (GtkTextRenderState *state, + GdkGC *gc, + GdkColor *color) +{ + gdk_colormap_alloc_color (gtk_widget_get_colormap (state->widget), color, FALSE, TRUE); + gdk_gc_set_foreground (gc, color); +} + +static void +gtk_text_render_state_update (GtkTextRenderState *state, + GtkTextAppearance *new_appearance) +{ + if (!state->last_appearance || + !gdk_color_equal (&new_appearance->fg_color, &state->last_appearance->fg_color)) + gtk_text_render_state_set_color (state, state->fg_gc, &new_appearance->fg_color); + + if (!state->last_appearance || + new_appearance->fg_stipple != state->last_appearance->fg_stipple) + { + if (new_appearance->fg_stipple) + { + gdk_gc_set_fill(state->fg_gc, GDK_STIPPLED); + gdk_gc_set_stipple(state->fg_gc, new_appearance->fg_stipple); + } + else + { + gdk_gc_set_fill(state->fg_gc, GDK_SOLID); + } + } + + if (new_appearance->draw_bg) + { + if (!state->last_appearance || + !gdk_color_equal (&new_appearance->bg_color, &state->last_appearance->bg_color)) + gtk_text_render_state_set_color (state, state->bg_gc, &new_appearance->bg_color); + + if (!state->last_appearance || + new_appearance->bg_stipple != state->last_appearance->bg_stipple) + { + if (new_appearance->bg_stipple) + { + gdk_gc_set_fill(state->bg_gc, GDK_STIPPLED); + gdk_gc_set_stipple(state->bg_gc, new_appearance->bg_stipple); + } + else + { + gdk_gc_set_fill(state->bg_gc, GDK_SOLID); + } + } + } + + state->last_appearance = new_appearance; +} + +static void +render_layout_line (GdkDrawable *drawable, + GtkTextRenderState *render_state, + PangoLayoutLine *line, + int x, + int y, + gboolean selected) +{ + GSList *tmp_list = line->runs; + PangoRectangle overall_rect; + PangoRectangle logical_rect; + PangoRectangle ink_rect; + + gint x_off = 0; + + pango_layout_line_get_extents (line, NULL, &overall_rect); + + while (tmp_list) + { + PangoLayoutRun *run = tmp_list->data; + GtkTextAppearance *appearance; + + tmp_list = tmp_list->next; + + get_item_properties (run->item, &appearance); + + if (appearance) /* A text segment */ + { + GdkGC *fg_gc; + + if (selected) + { + fg_gc = render_state->widget->style->fg_gc[GTK_STATE_SELECTED]; + } + else + { + gtk_text_render_state_update (render_state, appearance); + + fg_gc = render_state->fg_gc; + } + + if (appearance->underline == PANGO_UNDERLINE_NONE && !appearance->overstrike) + pango_glyph_string_extents (run->glyphs, run->item->analysis.font, + NULL, &logical_rect); + else + pango_glyph_string_extents (run->glyphs, run->item->analysis.font, + &ink_rect, &logical_rect); + + if (appearance->draw_bg && !selected) + gdk_draw_rectangle (drawable, render_state->bg_gc, TRUE, + x + (x_off + logical_rect.x) / PANGO_SCALE, + y + logical_rect.y / PANGO_SCALE, + logical_rect.width / PANGO_SCALE, + logical_rect.height / PANGO_SCALE); + + gdk_draw_glyphs (drawable, fg_gc, + run->item->analysis.font, + x + x_off / PANGO_SCALE, y, run->glyphs); + + switch (appearance->underline) + { + case PANGO_UNDERLINE_NONE: + break; + case PANGO_UNDERLINE_DOUBLE: + gdk_draw_line (drawable, fg_gc, + x + (x_off + ink_rect.x) / PANGO_SCALE - 1, y + 4, + x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, y + 4); + /* Fall through */ + case PANGO_UNDERLINE_SINGLE: + gdk_draw_line (drawable, fg_gc, + x + (x_off + ink_rect.x) / PANGO_SCALE - 1, y + 2, + x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, y + 2); + break; + case PANGO_UNDERLINE_LOW: + gdk_draw_line (drawable, fg_gc, + x + (x_off + ink_rect.x) / PANGO_SCALE - 1, y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 2, + x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 2); + break; + } + + if (appearance->overstrike) + { + gint overstrike_y = y + (0.3 * logical_rect.y) / PANGO_SCALE; + gdk_draw_line (drawable, fg_gc, + x + (x_off + ink_rect.x) / PANGO_SCALE - 1, overstrike_y, + x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, overstrike_y); + } + + x_off += logical_rect.width; + } + } +} + +static void +render_para (GdkDrawable *drawable, + GtkTextRenderState *render_state, + GtkTextLineDisplay *line_display, + int x, + int y, + int selection_start_index, + int selection_end_index) +{ + PangoRectangle logical_rect; + GSList *tmp_list; + PangoAlignment align; + PangoLayout *layout = line_display->layout; + int indent; + int total_width; + int y_offset = 0; + int byte_offset = 0; + + gboolean first = TRUE; + + indent = pango_layout_get_indent (layout); + total_width = pango_layout_get_width (layout); + align = pango_layout_get_alignment (layout); + + if (total_width < 0) + total_width = line_display->total_width * PANGO_SCALE; + + tmp_list = pango_layout_get_lines (layout); + while (tmp_list) + { + PangoLayoutLine *line = tmp_list->data; + int x_offset; + int selection_y, selection_height; + + pango_layout_line_get_extents (line, NULL, &logical_rect); + + x_offset = line_display->left_margin * PANGO_SCALE; + + switch (align) + { + case PANGO_ALIGN_RIGHT: + x_offset += total_width - logical_rect.width; + break; + case PANGO_ALIGN_CENTER: + x_offset += (total_width - logical_rect.width) / 2; + break; + default: + break; + } + + if (first) + { + if (indent > 0) + { + if (align == PANGO_ALIGN_LEFT) + x_offset += indent; + else + x_offset -= indent; + } + } + else + { + if (indent < 0) + { + if (align == PANGO_ALIGN_LEFT) + x_offset -= indent; + else + x_offset += indent; + } + } + + selection_y = y + y_offset / PANGO_SCALE; + selection_height = logical_rect.height / PANGO_SCALE; + + if (first) + { + selection_y -= line_display->top_margin; + selection_height += line_display->top_margin; + } + if (!tmp_list->next) + selection_height += line_display->bottom_margin; + + first = FALSE; + + if (selection_start_index < byte_offset && + selection_end_index > line->length + byte_offset) /* All selected */ + { + gdk_draw_rectangle (drawable, + render_state->widget->style->bg_gc[GTK_STATE_SELECTED], + TRUE, + x + line_display->left_margin, selection_y, + total_width / PANGO_SCALE, selection_height); + render_layout_line (drawable, render_state, + line, x + x_offset / PANGO_SCALE, y + (y_offset - logical_rect.y) / PANGO_SCALE, + TRUE); + } + else + { + render_layout_line (drawable, render_state, + line, x + x_offset / PANGO_SCALE, y + (y_offset - logical_rect.y) / PANGO_SCALE, + FALSE); + + if (selection_start_index < byte_offset + line->length && + selection_end_index > byte_offset) /* Some selected */ + { + GdkRegion *clip_region = get_selected_clip (render_state, layout, line, + x + line_display->x_offset, + selection_y, selection_height, + selection_start_index, selection_end_index); + + gdk_gc_set_clip_region (render_state->widget->style->fg_gc [GTK_STATE_SELECTED], clip_region); + gdk_gc_set_clip_region (render_state->widget->style->bg_gc [GTK_STATE_SELECTED], clip_region); + + gdk_draw_rectangle (drawable, + render_state->widget->style->bg_gc[GTK_STATE_SELECTED], + TRUE, + x + x_offset / PANGO_SCALE, selection_y, + logical_rect.width / PANGO_SCALE, + selection_height); + + render_layout_line (drawable, render_state, + line, x + x_offset / PANGO_SCALE, y + (y_offset - logical_rect.y) / PANGO_SCALE, + TRUE); + + gdk_gc_set_clip_region (render_state->widget->style->fg_gc [GTK_STATE_SELECTED], NULL); + gdk_gc_set_clip_region (render_state->widget->style->bg_gc [GTK_STATE_SELECTED], NULL); + + gdk_region_destroy (clip_region); + + /* Paint in the ends of the line */ + if (x_offset > line_display->left_margin * PANGO_SCALE && + ((line_display->direction == GTK_TEXT_DIR_LTR && selection_start_index < byte_offset) || + (line_display->direction == GTK_TEXT_DIR_RTL && selection_end_index > byte_offset + line->length))) + { + gdk_draw_rectangle (drawable, + render_state->widget->style->bg_gc[GTK_STATE_SELECTED], + TRUE, + x + line_display->left_margin, selection_y, + x + x_offset / PANGO_SCALE - line_display->left_margin, + selection_height); + } + + if (x_offset + logical_rect.width < line_display->left_margin * PANGO_SCALE + total_width && + ((line_display->direction == GTK_TEXT_DIR_LTR && selection_end_index > byte_offset + line->length) || + (line_display->direction == GTK_TEXT_DIR_RTL && selection_start_index < byte_offset))) + { + + + gdk_draw_rectangle (drawable, + render_state->widget->style->bg_gc[GTK_STATE_SELECTED], + TRUE, + x + (x_offset + logical_rect.width) / PANGO_SCALE, + selection_y, + x + (line_display->left_margin * PANGO_SCALE + total_width - x_offset - logical_rect.width) / PANGO_SCALE, + selection_height); + } + } + } + + byte_offset += line->length; + y_offset += logical_rect.height; + tmp_list = tmp_list->next; + } +} + +static GdkRegion * +get_selected_clip (GtkTextRenderState *render_state, + PangoLayout *layout, + PangoLayoutLine *line, + int x, + int y, + int height, + int start_index, + int end_index) +{ + gint *ranges; + gint n_ranges, i; + GdkRegion *clip_region = gdk_region_new (); + GdkRegion *tmp_region; + PangoRectangle logical_rect; + + pango_layout_line_get_extents (line, NULL, &logical_rect); + pango_layout_line_get_x_ranges (line, start_index, end_index, &ranges, &n_ranges); + + for (i=0; i < n_ranges; i++) + { + GdkRectangle rect; + + rect.x = x + ranges[2*i] / PANGO_SCALE; + rect.y = y; + rect.width = (ranges[2*i + 1] - ranges[2*i]) / PANGO_SCALE; + rect.height = height; + + gdk_region_union_with_rect (clip_region, &rect); + } + + tmp_region = gdk_region_rectangle (&render_state->clip_rect); + gdk_region_intersect (clip_region, tmp_region); + gdk_region_destroy (tmp_region); + + g_free (ranges); + return clip_region; +} + +static void +get_item_properties (PangoItem *item, + GtkTextAppearance **appearance) +{ + GSList *tmp_list = item->extra_attrs; + + *appearance = NULL; + + while (tmp_list) + { + PangoAttribute *attr = tmp_list->data; + + if (attr->klass->type == gtk_text_attr_appearance_type) + { + *appearance = &((GtkTextAttrAppearance *)attr)->appearance; + return; + } + } +} + +void +gtk_text_layout_draw (GtkTextLayout *layout, + GtkWidget *widget, + GdkDrawable *drawable, + /* Location of the layout + in buffer coordinates */ + gint x_offset, + gint y_offset, + /* Region of the layout to + render */ + gint x, + gint y, + gint width, + gint height) +{ + GdkRectangle clip; + gint current_y; + GSList *line_list; + GSList *tmp_list; + GSList *cursor_list; + GtkTextRenderState *render_state; + GtkTextIter selection_start, selection_end; + gboolean have_selection = FALSE; + + g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout)); + g_return_if_fail (layout->default_style != NULL); + g_return_if_fail (layout->buffer != NULL); + g_return_if_fail (drawable != NULL); + g_return_if_fail (x_offset >= 0); + g_return_if_fail (y_offset >= 0); + g_return_if_fail (width >= 0); + g_return_if_fail (height >= 0); + + if (width == 0 || height == 0) + return; + + line_list = gtk_text_layout_get_lines (layout, y + y_offset, y + y_offset + height, ¤t_y); + current_y -= y_offset; + + if (line_list == NULL) + return; /* nothing on the screen */ + + clip.x = x; + clip.y = y; + clip.width = width; + clip.height = height; + + render_state = gtk_text_render_state_new (widget, drawable, &clip); + + gdk_gc_set_clip_rectangle (render_state->fg_gc, &clip); + gdk_gc_set_clip_rectangle (render_state->bg_gc, &clip); + + gtk_text_layout_wrap_loop_start (layout); + + if (gtk_text_buffer_get_selection_bounds (layout->buffer, + &selection_start, + &selection_end)) + have_selection = TRUE; + + tmp_list = line_list; + while (tmp_list != NULL) + { + GtkTextLineDisplay *line_display; + gint selection_start_index = -1; + gint selection_end_index = -1; + + GtkTextLine *line = tmp_list->data; + + line_display = gtk_text_layout_get_line_display (layout, line, FALSE); + + if (have_selection) + { + GtkTextIter line_start, line_end; + gint byte_count = gtk_text_line_byte_count (line); + + gtk_text_btree_get_iter_at_line (layout->buffer->tree, &line_start, + line, 0); + gtk_text_btree_get_iter_at_line (layout->buffer->tree, &line_end, + line, byte_count - 1); + + if (gtk_text_iter_compare (&selection_start, &line_end) < 0 && + gtk_text_iter_compare (&selection_end, &line_start) > 0) + { + if (gtk_text_iter_compare (&selection_start, &line_start) >= 0) + selection_start_index = gtk_text_iter_get_line_byte (&selection_start); + else + selection_start_index = -1; + + if (gtk_text_iter_compare (&selection_end, &line_end) <= 0) + selection_end_index = gtk_text_iter_get_line_byte (&selection_end); + else + selection_end_index = byte_count; + } + } + + render_para (drawable, render_state, line_display, + - x_offset, + current_y + line_display->top_margin, + selection_start_index, selection_end_index); + + + /* We paint the cursors last, because they overlap another chunk + and need to appear on top. */ + + cursor_list = line_display->cursors; + while (cursor_list) + { + GtkTextCursorDisplay *cursor = cursor_list->data; + GdkGC *gc; + + if (cursor->is_strong) + gc = widget->style->bg_gc[GTK_STATE_SELECTED]; + else + gc = widget->style->fg_gc[GTK_STATE_NORMAL]; + + gdk_draw_line (drawable, gc, + line_display->x_offset + cursor->x, + current_y + line_display->top_margin + cursor->y, + line_display->x_offset + cursor->x, + current_y + line_display->top_margin + cursor->y + cursor->height); + + cursor_list = cursor_list->next; + } + + current_y += line_display->height; + gtk_text_layout_free_line_display (layout, line_display); + + tmp_list = g_slist_next (tmp_list); + } + + gtk_text_layout_wrap_loop_end (layout); + gtk_text_render_state_destroy (render_state); + + g_slist_free (line_list); +} |