First Commit

libui-ng/unix/slider.c

@@ -0,0 +1,143 @@
+// 11 june 2015
+#include "uipriv_unix.h"
+
+/* Number of digits to represent an n-bit number in decimal: log10(2^n)
+ * Simplify, truncate & add 1 for full digits, add 1 for negative numbers:
+ *   -> n log10(2) + 2   <=   n * 0.302 + 2
+ */
+#define MAX_STRLEN_FOR_NBITS_IN_DECIMAL(n) ((int)((n) * 302 / 1000) + 2)
+
+struct uiSlider {
+	uiUnixControl c;
+	GtkWidget *widget;
+	GtkRange *range;
+	GtkScale *scale;
+	void (*onChanged)(uiSlider *, void *);
+	void *onChangedData;
+	void (*onReleased)(uiSlider *, void *);
+	void *onReleasedData;
+	gulong onChangedSignal;
+	gchar tooltip[MAX_STRLEN_FOR_NBITS_IN_DECIMAL(sizeof(int) * CHAR_BIT) + 1];
+};
+
+uiUnixControlAllDefaults(uiSlider)
+
+static void _uiSliderUpdateToolTip(uiSlider *s)
+{
+	g_snprintf(s->tooltip, sizeof(s->tooltip)/sizeof(s->tooltip[0]), "%d", uiSliderValue(s));
+	gtk_widget_set_tooltip_text(s->widget, s->tooltip);
+}
+
+static void onChanged(GtkRange *range, gpointer data)
+{
+	uiSlider *s = uiSlider(data);
+
+	(*(s->onChanged))(s, s->onChangedData);
+
+	if (uiSliderHasToolTip(s))
+		_uiSliderUpdateToolTip(s);
+}
+
+static void defaultOnChanged(uiSlider *s, void *data)
+{
+	// do nothing
+}
+
+static gboolean onReleased(GtkWidget *w, GdkEventButton *event, gpointer data)
+{
+	uiSlider *s = uiSlider(data);
+
+	(*(s->onReleased))(s, s->onReleasedData);
+	return FALSE;
+}
+
+static void defaultOnReleased(uiSlider *s, void *data)
+{
+	// do nothing
+}
+
+int uiSliderValue(uiSlider *s)
+{
+	return gtk_range_get_value(s->range);
+}
+
+void uiSliderSetValue(uiSlider *s, int value)
+{
+	// we need to inhibit sending of ::value-changed because this WILL send a ::value-changed otherwise
+	g_signal_handler_block(s->range, s->onChangedSignal);
+	gtk_range_set_value(s->range, value);
+	g_signal_handler_unblock(s->range, s->onChangedSignal);
+}
+
+int uiSliderHasToolTip(uiSlider *s)
+{
+	return gtk_widget_get_has_tooltip(s->widget);
+}
+
+void uiSliderSetHasToolTip(uiSlider *s, int hasToolTip)
+{
+	gtk_widget_set_has_tooltip(s->widget, hasToolTip);
+
+	if (hasToolTip)
+		_uiSliderUpdateToolTip(s);
+}
+
+void uiSliderOnChanged(uiSlider *s, void (*f)(uiSlider *, void *), void *data)
+{
+	s->onChanged = f;
+	s->onChangedData = data;
+}
+
+void uiSliderOnReleased(uiSlider *s, void (*f)(uiSlider *, void *), void *data)
+{
+	s->onReleased = f;
+	s->onReleasedData = data;
+}
+
+void uiSliderSetRange(uiSlider *s, int min, int max)
+{
+	int temp;
+
+	if (min >= max) {
+		temp = min;
+		min = max;
+		max = temp;
+	}
+
+	// we need to inhibit sending of ::value-changed because this WILL send a ::value-changed otherwise
+	g_signal_handler_block(s->range, s->onChangedSignal);
+	gtk_range_set_range(s->range, min, max);
+	g_signal_handler_unblock(s->range, s->onChangedSignal);
+}
+
+uiSlider *uiNewSlider(int min, int max)
+{
+	uiSlider *s;
+	int temp;
+
+	if (min >= max) {
+		temp = min;
+		min = max;
+		max = temp;
+	}
+
+	uiUnixNewControl(uiSlider, s);
+
+	s->widget = gtk_scale_new_with_range(GTK_ORIENTATION_HORIZONTAL, min, max, 1);
+	s->range = GTK_RANGE(s->widget);
+	s->scale = GTK_SCALE(s->widget);
+
+	// do not draw value, show tooltip instead
+	gtk_scale_set_draw_value(s->scale, 0);
+	uiSliderSetHasToolTip(s, 1);
+
+	// ensure integers, just to be safe
+	gtk_scale_set_digits(s->scale, 0);
+
+	s->onChangedSignal = g_signal_connect(s->scale, "value-changed", G_CALLBACK(onChanged), s);
+	g_signal_connect(s->scale, "button-release-event", G_CALLBACK(onReleased), s);
+	uiSliderOnChanged(s, defaultOnChanged, NULL);
+	uiSliderOnReleased(s, defaultOnReleased, NULL);
+
+	return s;
+}