mirror of
git://projects.qi-hardware.com/eda-tools.git
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546 lines
12 KiB
C
546 lines
12 KiB
C
/*
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* gui/over.c - GUI: overlays
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*
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* Written 2016 by Werner Almesberger
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* Copyright 2016 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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/*
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* Resources:
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*
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* http://zetcode.com/gfx/cairo/cairobackends/
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* https://developer.gnome.org/gtk3/stable/gtk-migrating-2-to-3.html
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* https://www.cairographics.org/samples/rounded_rectangle/
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*
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* Section "Description" in
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* https://developer.gnome.org/pango/stable/pango-Cairo-Rendering.html
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*/
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#include <stddef.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#include <assert.h>
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#include <cairo/cairo.h>
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#include <pango/pangocairo.h>
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#include "misc/util.h"
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#include "gui/fmt-pango.h"
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#include "gui/aoi.h"
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#include "gui/style.h"
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#include "gui/over.h"
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struct overlay {
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const char *s;
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cairo_surface_t *icon;
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struct overlay_style style;
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struct aoi **aois;
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bool (*hover)(void *user, bool on, int dx, int dy);
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void (*click)(void *user);
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void *user;
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struct aoi *aoi;
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const struct overlay *related;
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struct overlay *next, *prev;
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};
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/* ----- Drawing helper functions ------------------------------------------ */
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static void rrect(cairo_t *cr, double x, double y, double w, double h, int r)
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{
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const double deg = M_PI / 180.0;
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cairo_new_path(cr);
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cairo_arc(cr, x + w - r, y + r, r, -90 * deg, 0);
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cairo_arc(cr, x + w - r, y + h - r, r, 0, 90 * deg);
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cairo_arc(cr, x + r, y + h - r, r, 90 * deg, 180 * deg);
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cairo_arc(cr, x + r, y + r, r, 180 * deg, 270 * deg);
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cairo_close_path(cr);
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}
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static void background(const struct overlay *over, cairo_t *cr,
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int x, int y, unsigned w, unsigned h)
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{
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const struct overlay_style *style = &over->style;
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const struct color *bg = &style->bg;
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const struct color *frame = &style->frame;
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double center;
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center = style->width / 2.0;
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rrect(cr, x - center, y - center, w + style->width, h + style->width,
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style->radius);
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cairo_set_source_rgba(cr, bg->r, bg->g, bg->b, bg->alpha);
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cairo_fill_preserve(cr);
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cairo_set_source_rgba(cr, frame->r, frame->g, frame->b, frame->alpha);
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cairo_set_line_width(cr, style->width);
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cairo_stroke(cr);
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}
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static void post_aoi(struct overlay *over, int x, int y, unsigned w, unsigned h)
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{
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struct aoi aoi_cfg = {
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.x = x,
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.y = y,
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.w = w,
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.h = h,
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.hover = over->hover,
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.click = over->click,
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.user = over->user,
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};
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if (!over->hover && !over->click)
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return;
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if (over->aoi) {
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aoi_update(over->aoi, &aoi_cfg);
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} else {
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over->aoi = aoi_add(over->aois, &aoi_cfg);
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if (over->related) {
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assert(over->related->aoi);
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aoi_set_related(over->aoi, over->related->aoi);
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}
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}
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}
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/* ----- Drawing text ------------------------------------------------------ */
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static unsigned overlay_draw_text(struct overlay *over, cairo_t *cr,
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int x, int y, int dx, int dy)
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{
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const struct overlay_style *style = &over->style;
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const struct color *fg = &style->fg;
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unsigned ink_w, ink_h; /* effectively used text area size */
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unsigned w, h; /* box size */
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int tx, ty; /* text start position */
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PangoLayout *layout;
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PangoFontDescription *desc;
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PangoRectangle ink_rect;
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desc = pango_font_description_from_string(style->font);
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layout = pango_cairo_create_layout(cr);
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pango_layout_set_font_description(layout, desc);
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pango_layout_set_markup(layout, over->s, -1);
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pango_font_description_free(desc);
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pango_layout_get_extents(layout, &ink_rect, NULL);
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#if 0
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fprintf(stderr, "%d + %d %d + %d\n",
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ink_rect.x / PANGO_SCALE, ink_rect.width / PANGO_SCALE,
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ink_rect.y / PANGO_SCALE, ink_rect.height / PANGO_SCALE);
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#endif
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ink_w = ink_rect.width / PANGO_SCALE;
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ink_h = ink_rect.height / PANGO_SCALE;
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ink_w = ink_w > style->wmin ? ink_w : style->wmin;
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ink_w = !style->wmax || ink_w < style->wmax ? ink_w : style->wmax;
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w = ink_w + 2 * style->pad;
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ink_h = ink_h > style->hmin ? ink_h : style->hmin;
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ink_h = !style->hmax || ink_h < style->hmax ? ink_h : style->hmax;
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h = ink_h + 2 * style->pad;
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if (dx < 0)
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x -= w;
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if (dy < 0)
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y -= h;
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tx = x - ink_rect.x / PANGO_SCALE + style->pad;
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ty = y - ink_rect.y / PANGO_SCALE + style->pad;
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background(over, cr, x, y, w, h);
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if (style->wmax) {
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cairo_new_path(cr);
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#if 0
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fprintf(stderr, "%u(%d) %u %.60s\n", ty, ink_rect.y / PANGO_SCALE, ink_h, over->s);
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#endif
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/*
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* @@@ for some mysterious reason, we get
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* ink_h = ink_rect.height / PANGO_SCALE = 5
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* instead of 2 if using overlay_style_dense_selected. Strangely, changing
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* overlay_style_dense_selected such that it becomes more like
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* overlay_style_dense has no effect.
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*
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* This causes the text to be cut vertically, roughly in the middle. We hack
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* around this problem by growind the clipping area vertically. This works,
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* since we're currently only concerned about horizontal clipping anyway.
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*/
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cairo_rectangle(cr, tx, ty, ink_w, ink_h + 20);
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cairo_clip(cr);
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}
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cairo_set_source_rgba(cr, fg->r, fg->g, fg->b, fg->alpha);
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cairo_move_to(cr, tx, ty);
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pango_cairo_update_layout(cr, layout);
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pango_cairo_show_layout(cr, layout);
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cairo_reset_clip(cr);
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g_object_unref(layout);
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post_aoi(over, x, y, w, h);
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return h;
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}
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/* ----- Drawing an icon --------------------------------------------------- */
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static unsigned overlay_draw_icon(struct overlay *over, cairo_t *cr,
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int x, int y, int dx, int dy)
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{
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const struct overlay_style *style = &over->style;
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unsigned iw, ih; /* icon size */
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unsigned w, h; /* box size */
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int ix, iy; /* icon start position */
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iw = cairo_image_surface_get_width(over->icon);
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iw = iw > style->wmin ? iw : style->wmin;
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iw = !style->wmax || iw < style->wmax ? iw : style->wmax;
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ih = cairo_image_surface_get_height(over->icon);
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ih = ih > style->hmin ? ih : style->hmin;
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ih = !style->hmax || ih < style->hmax ? ih : style->hmax;
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w = iw + 2 * style->pad;
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h = ih + 2 * style->pad;
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if (dx < 0)
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x -= w;
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if (dy < 0)
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y -= h;
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ix = x + style->pad;
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iy = y + style->pad;
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background(over, cr, x, y, w, h);
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cairo_set_source_surface(cr, over->icon, ix, iy);
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cairo_paint(cr);
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post_aoi(over, x, y, w, h);
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return h;
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}
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/* ----- Drawing interfaces ------------------------------------------------ */
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static unsigned overlay_draw(struct overlay *over, cairo_t *cr,
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int x, int y, int dx, int dy)
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{
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if (over->s)
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return overlay_draw_text(over, cr, x, y, dx, dy);
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else
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return overlay_draw_icon(over, cr, x, y, dx, dy);
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}
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void overlay_draw_all_d(struct overlay *overlays, cairo_t *cr,
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int x, int y, int dx, int dy)
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{
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struct overlay *over = overlays;
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unsigned h;
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if (dy < 0)
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while (over && over->next)
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over = over->next;
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while (over) {
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h = overlay_draw(over, cr, x, y, dx, dy);
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y += dy * (h + over->style.skip);
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if (dy >= 0)
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over = over->next;
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else
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over = over->prev;
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}
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}
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void overlay_draw_all(struct overlay *overlays, cairo_t *cr, int x, int y)
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{
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int dx = 1;
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int dy = 1;
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if (x < 0 || y < 0) {
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double x1, y1, x2, y2;
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int sw, sh;
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cairo_clip_extents(cr, &x1, &y1, &x2, &y2);
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sw = x2 - x1;
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sh = y2 - y1;
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if (x < 0) {
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x = sw + x;
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dx = -1;
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}
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if (y < 0) {
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y = sh + y;
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dy = -1;
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}
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}
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overlay_draw_all_d(overlays, cr, x, y, dx, dy);
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}
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/* ----- Sizing text ------------------------------------------------------- */
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static void overlay_size_text(const struct overlay *over,
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PangoContext *pango_context, int *w, int *h)
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{
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const struct overlay_style *style = &over->style;
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PangoLayout *layout;
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PangoFontDescription *desc;
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PangoRectangle ink_rect;
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unsigned ink_w, ink_h; /* effectively used text area size */
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/*
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* Note that we need the caller to provide the Cairo context, because
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* the font size changes subtly even between image (which we could
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* create locally) and screen (which is better left to the outside
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* world).
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*/
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desc = pango_font_description_from_string(style->font);
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layout = pango_layout_new(pango_context);
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pango_layout_set_font_description(layout, desc);
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pango_layout_set_markup(layout, over->s, -1);
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pango_font_description_free(desc);
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pango_layout_get_extents(layout, &ink_rect, NULL);
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g_object_unref(layout);
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ink_w = ink_rect.width / PANGO_SCALE;
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ink_h = ink_rect.height / PANGO_SCALE;
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ink_w = ink_w > style->wmin ? ink_w : style->wmin;
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ink_w = !style->wmax || ink_w < style->wmax ? ink_w : style->wmax;
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ink_h = ink_h > style->hmin ? ink_h : style->hmin;
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ink_h = !style->hmax || ink_h < style->hmax ? ink_h : style->hmax;
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if (w)
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*w = ink_w + 2 * style->pad;
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if (h)
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*h = ink_h + 2 * style->pad;
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}
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/* ----- Sizing icons ------------------------------------------------------ */
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static void overlay_size_icon(const struct overlay *over, int *w, int *h)
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{
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const struct overlay_style *style = &over->style;
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unsigned iw, ih; /* effectively used icon size */
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iw = cairo_image_surface_get_width(over->icon);
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iw = iw > style->wmin ? iw : style->wmin;
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iw = !style->wmax || iw < style->wmax ? iw : style->wmax;
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ih = cairo_image_surface_get_height(over->icon);
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ih = ih > style->hmin ? ih : style->hmin;
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ih = !style->hmax || ih < style->hmax ? ih : style->hmax;
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if (w)
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*w = iw + 2 * style->pad;
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if (h)
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*h = ih + 2 * style->pad;
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}
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/* ----- Sizing ------------------------------------------------------------ */
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void overlay_size(const struct overlay *over, PangoContext *pango_context,
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int *w, int *h)
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{
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if (over->s)
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overlay_size_text(over, pango_context, w, h);
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else
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overlay_size_icon(over, w, h);
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}
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void overlay_size_all(const struct overlay *overlays,
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PangoContext *pango_context, bool dx, bool dy, int *w, int *h)
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{
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const struct overlay *over;
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int w1, h1;
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if (w)
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*w = 0;
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if (h)
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*h = 0;
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for (over = overlays; over; over = over->next) {
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int skip = over == overlays ? 0 : over->style.skip;
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overlay_size(over, pango_context, &w1, &h1);
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if (w) {
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if (dx)
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*w += w1 + skip;
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else
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*w = *w > w1 ? *w : w1;
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}
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if (h) {
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if (dy)
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*h += h1 + skip;
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else
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*h = *h > h1 ? *h : h1;
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}
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}
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}
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/* ----- Creation ---------------------------------------------------------- */
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struct overlay *overlay_add(struct overlay **overlays, struct aoi **aois,
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bool (*hover)(void *user, bool on, int dx, int dy),
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void (*click)(void *user), void *user)
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{
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struct overlay *over, *prev;
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struct overlay **anchor;
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over = alloc_type(struct overlay);
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over->s = NULL;
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over->icon = NULL;
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over->style = overlay_style_default;
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over->aois = aois;
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over->hover = hover;
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over->click = click;
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over->user = user;
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over->aoi = NULL;
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over->related = NULL;
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prev = NULL;
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for (anchor = overlays; *anchor; anchor = &(*anchor)->next)
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prev = *anchor;
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over->next = NULL;
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over->prev = prev;
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*anchor = over;
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return over;
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}
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/* ----- Configuration ----------------------------------------------------- */
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void overlay_style(struct overlay *over, const struct overlay_style *style)
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{
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over->style = *style;
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}
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void overlay_text_raw(struct overlay *over, const char *s)
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{
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free((char *) over->s);
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over->s = stralloc(s);
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}
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void overlay_text(struct overlay *over, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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overlay_text_raw(over, vfmt_pango(fmt, ap));
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va_end(ap);
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}
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void overlay_icon(struct overlay *over, cairo_surface_t *icon)
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{
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assert(!over->s);
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over->icon = cairo_surface_reference(icon);
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}
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/* ----- Nesting ----------------------------------------------------------- */
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void overlay_set_related(struct overlay *over, struct overlay *related)
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{
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/*
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* Relatedness is a property that only matters to AoIs, but we have to
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* defer propagating it because we only know our AoI after drawing the
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* overlay.
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*/
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assert(!over->related);
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over->related = related;
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}
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void overlay_set_related_all(struct overlay *overlays, struct overlay *related)
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{
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struct overlay *over;
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for (over = overlays; over; over = over->next)
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overlay_set_related(over, related);
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}
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/* ----- Removal ----------------------------------------------------------- */
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static void overlay_free(struct overlay *over)
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{
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if (over->aoi)
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aoi_remove(over->aois, over->aoi);
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free((void *) over->s);
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if (!over->s)
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cairo_surface_destroy(over->icon);
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free(over);
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}
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void overlay_remove(struct overlay **overlays, struct overlay *over)
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{
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if (over->next)
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over->next->prev = over->prev;
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if (over->prev)
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over->prev->next = over->next;
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else
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*overlays = over->next;
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overlay_free(over);
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}
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void overlay_remove_all(struct overlay **overlays)
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{
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struct overlay *next;
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while (*overlays) {
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next = (*overlays)->next;
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overlay_remove(overlays, *overlays);
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*overlays = next;
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}
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}
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