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