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Make GtkDial dimmer if insensitive

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This commit is contained in:
Geoffrey D. Bennett
2024-01-22 19:32:09 +10:30
parent 7c44f15428
commit e655ee39ce
1 changed files with 50 additions and 15 deletions
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65
src/gtkdial.c
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@@ -217,6 +217,7 @@ struct dial_properties {
double angle;
double slider_cx;
double slider_cy;
int dim;
};
static int calculate_dial_height(int width) {
@@ -272,6 +273,8 @@ static void get_dial_properties(
double slider_radius = props->radius - props->slider_thickness / 2;
props->slider_cx = cos(props->angle) * slider_radius + props->cx;
props->slider_cy = sin(props->angle) * slider_radius + props->cy;
props->dim = !gtk_widget_is_sensitive(GTK_WIDGET(dial));
}
static double pdist2(double x1, double y1, double x2, double y2) {
@@ -496,6 +499,38 @@ static void dial_measure(
*natural_baseline = -1;
}
// internal replacement for cairo_set_source_rgba() that dims the
// color if the widget is insensitive
static void cairo_set_source_rgba_dim(
cairo_t *cr,
double r,
double g,
double b,
double a,
int dim
) {
if (dim)
cairo_set_source_rgba(cr, r * 0.5, g * 0.5, b * 0.5, a);
else
cairo_set_source_rgba(cr, r, g, b, a);
}
// internal replacement for cairo_pattern_add_color_stop_rgb() that
// dims the color if the widget is insensitive
static void cairo_add_stop_rgb_dim(
cairo_pattern_t *pat,
double offset,
double r,
double g,
double b,
int dim
) {
if (dim)
cairo_pattern_add_color_stop_rgb(pat, offset, r * 0.5, g * 0.5, b * 0.5);
else
cairo_pattern_add_color_stop_rgb(pat, offset, r, g, b);
}
static void dial_snapshot(GtkWidget *widget, GtkSnapshot *snapshot) {
GtkDial *dial = GTK_DIAL(widget);
@@ -516,20 +551,20 @@ static void dial_snapshot(GtkWidget *widget, GtkSnapshot *snapshot) {
// background line
cairo_arc(cr, p.cx, p.cy, slider_radius, ANGLE_START, ANGLE_END);
cairo_set_line_width(cr, 2);
cairo_set_source_rgba(cr, 1, 1, 1, 0.17);
cairo_set_source_rgba_dim(cr, 1, 1, 1, 0.17, p.dim);
cairo_stroke(cr);
if (p.valp > 0.0) {
// outside value shadow
cairo_arc(cr, p.cx, p.cy, background_radius, ANGLE_START, p.angle);
cairo_set_line_width(cr, p.slider_thickness / 2);
cairo_set_source_rgba(cr, 1, 1, 1, 0.15);
cairo_set_source_rgba_dim(cr, 1, 1, 1, 0.1, p.dim);
cairo_stroke(cr);
// value blur 2
cairo_arc(cr, p.cx, p.cy, slider_radius, ANGLE_START, p.angle);
cairo_set_line_width(cr, 6);
cairo_set_source_rgba(cr, 1, 1, 1, 0.3);
cairo_set_source_rgba_dim(cr, 1, 1, 1, 0.3, p.dim);
cairo_stroke(cr);
}
@@ -552,7 +587,7 @@ static void dial_snapshot(GtkWidget *widget, GtkSnapshot *snapshot) {
cairo_move_to(cr, p.cx, p.cy);
cairo_line_to(cr, zero_db_x, zero_db_y);
cairo_set_line_width(cr, 2);
cairo_set_source_rgba(cr, 1, 1, 1, 0.17);
cairo_set_source_rgba_dim(cr, 1, 1, 1, 0.17, p.dim);
cairo_stroke(cr);
}
@@ -562,7 +597,7 @@ static void dial_snapshot(GtkWidget *widget, GtkSnapshot *snapshot) {
cairo_move_to(cr, p.cx, p.cy);
cairo_line_to(cr, p.slider_cx, p.slider_cy);
cairo_set_line_width(cr, 2);
cairo_set_source_rgba(cr, 1, 1, 1, 0.5);
cairo_set_source_rgba_dim(cr, 1, 1, 1, 0.5, p.dim);
cairo_stroke(cr);
}
@@ -570,13 +605,13 @@ static void dial_snapshot(GtkWidget *widget, GtkSnapshot *snapshot) {
// value blur 1
cairo_arc(cr, p.cx, p.cy, slider_radius, ANGLE_START, p.angle);
cairo_set_line_width(cr, 4);
cairo_set_source_rgba(cr, 1, 1, 1, 0.5);
cairo_set_source_rgba_dim(cr, 1, 1, 1, 0.5, p.dim);
cairo_stroke(cr);
// value
cairo_arc(cr, p.cx, p.cy, slider_radius, ANGLE_START, p.angle);
cairo_set_line_width(cr, 2);
cairo_set_source_rgb(cr, 1, 1, 1);
cairo_set_source_rgba_dim(cr, 1, 1, 1, 1, p.dim);
cairo_stroke(cr);
}
@@ -586,13 +621,13 @@ static void dial_snapshot(GtkWidget *widget, GtkSnapshot *snapshot) {
p.cx + 5, p.cy + 5, 0, p.cx, p.cy, p.radius
);
if (gtk_widget_has_focus(GTK_WIDGET(dial))) {
cairo_pattern_add_color_stop_rgb(pat, 0.0, 0.30, 0.30, 0.33);
cairo_pattern_add_color_stop_rgb(pat, 0.4, 0.30, 0.30, 0.33);
cairo_pattern_add_color_stop_rgb(pat, 1.0, 0.50, 0.50, 0.53);
cairo_add_stop_rgb_dim(pat, 0.0, 0.30, 0.30, 0.33, p.dim);
cairo_add_stop_rgb_dim(pat, 0.4, 0.30, 0.30, 0.33, p.dim);
cairo_add_stop_rgb_dim(pat, 1.0, 0.50, 0.50, 0.53, p.dim);
} else {
cairo_pattern_add_color_stop_rgb(pat, 0.0, 0.18, 0.18, 0.20);
cairo_pattern_add_color_stop_rgb(pat, 0.4, 0.18, 0.18, 0.20);
cairo_pattern_add_color_stop_rgb(pat, 1.0, 0.40, 0.40, 0.42);
cairo_add_stop_rgb_dim(pat, 0.0, 0.18, 0.18, 0.20, p.dim);
cairo_add_stop_rgb_dim(pat, 0.4, 0.18, 0.18, 0.20, p.dim);
cairo_add_stop_rgb_dim(pat, 1.0, 0.40, 0.40, 0.42, p.dim);
}
cairo_set_source(cr, pat);
@@ -607,8 +642,8 @@ static void dial_snapshot(GtkWidget *widget, GtkSnapshot *snapshot) {
p.cx + p.radius / 2,
p.cy + p.radius / 2
);
cairo_pattern_add_color_stop_rgb(pat2, 0, 0.9, 0.9, 0.9);
cairo_pattern_add_color_stop_rgb(pat2, 1, 0.3, 0.3, 0.3);
cairo_add_stop_rgb_dim(pat2, 0, 0.9, 0.9, 0.9, p.dim);
cairo_add_stop_rgb_dim(pat2, 1, 0.3, 0.3, 0.3, p.dim);
cairo_set_source(cr, pat2);
cairo_arc(cr, p.cx, p.cy, p.radius - p.slider_thickness, 0, 2 * M_PI);