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GtkThemingEngine: Rip out expander rendering from old code.

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This commit is contained in:
Carlos Garnacho 2010-08-02 15:49:45 +02:00
parent d22f393be3
commit eadaded374
1 changed files with 69 additions and 7 deletions
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76
gtk/gtkthemingengine.c
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@ -1070,7 +1070,15 @@ gtk_theming_engine_render_expander (GtkThemingEngine *engine,
GtkStateFlags flags;
GdkColor *bg_color, *fg_color, *base_color;
GtkStateType state;
double vertical_overshoot;
int diameter;
double radius;
double interp; /* interpolation factor for center position */
double x_double_horz, y_double_horz;
double x_double_vert, y_double_vert;
double x_double, y_double;
gdouble angle;
gint line_width;
cairo_save (cr);
flags = gtk_theming_engine_get_state (engine);
@ -1088,14 +1096,68 @@ gtk_theming_engine_render_expander (GtkThemingEngine *engine,
"base-color", &base_color,
NULL);
if (flags & GTK_STATE_FLAG_ACTIVE)
angle = G_PI;
else
angle = G_PI / 2;
line_width = 1;
cairo_set_line_width (cr, 1);
add_path_arrow (cr, angle, x + 2, y + 2,
MIN (width - 1, height - 1) - 4);
/* FIXME: LTR/RTL */
if (flags & GTK_STATE_FLAG_ACTIVE)
{
angle = G_PI / 2;
interp = 1.0;
}
else
{
angle = 0;
interp = 0;
}
/* Compute distance that the stroke extends beyonds the end
* of the triangle we draw.
*/
vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
/* For odd line widths, we end the vertical line of the triangle
* at a half pixel, so we round differently.
*/
if (line_width % 2 == 1)
vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
else
vertical_overshoot = ceil (vertical_overshoot);
/* Adjust the size of the triangle we draw so that the entire stroke fits
*/
diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
/* If the line width is odd, we want the diameter to be even,
* and vice versa, so force the sum to be odd. This relationship
* makes the point of the triangle look right.
*/
diameter -= (1 - (diameter + line_width) % 2);
radius = diameter / 2.;
/* Adjust the center so that the stroke is properly aligned with
* the pixel grid. The center adjustment is different for the
* horizontal and vertical orientations. For intermediate positions
* we interpolate between the two.
*/
x_double_vert = floor ((x + width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
y_double_vert = (y + height / 2) - 0.5;
x_double_horz = (x + width / 2) - 0.5;
y_double_horz = floor ((y + height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
cairo_translate (cr, x_double, y_double);
cairo_rotate (cr, angle);
cairo_move_to (cr, - radius / 2., - radius);
cairo_line_to (cr, radius / 2., 0);
cairo_line_to (cr, - radius / 2., radius);
cairo_close_path (cr);
cairo_set_line_width (cr, line_width);
if (flags & GTK_STATE_FLAG_PRELIGHT)
gdk_cairo_set_source_color (cr, fg_color);