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scrolledwindow: port indicator fade to progress tracker

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This commit is contained in:
Matt Watson 2016-03-28 14:54:34 -07:00
parent dc8b80cd32
commit 5237b7a6b0
1 changed files with 16 additions and 35 deletions
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51
gtk/gtkscrolledwindow.c
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@ -45,6 +45,7 @@
#include "gtkkineticscrolling.h"
#include "a11y/gtkscrolledwindowaccessible.h"
#include "gtkstylecontextprivate.h"
#include "gtkprogresstrackerprivate.h"
#include <math.h>
@ -193,8 +194,7 @@ typedef struct
gdouble current_pos;
gdouble source_pos;
gdouble target_pos;
gint64 start_time;
gint64 end_time;
GtkProgressTracker tracker;
guint tick_id;
guint over_timeout_id;
} Indicator;
@ -4002,40 +4002,22 @@ indicator_set_fade (Indicator *indicator,
}
}
static double
ease_out_cubic (double t)
{
double p = t - 1;
return p * p * p + 1;
}
static void
indicator_fade_step (Indicator *indicator,
gint64 now)
{
gdouble t;
if (now < indicator->end_time)
t = (now - indicator->start_time) / (gdouble) (indicator->end_time - indicator->start_time);
else
t = 1.0;
t = ease_out_cubic (t);
indicator_set_fade (indicator,
indicator->source_pos + (t * (indicator->target_pos - indicator->source_pos)));
}
static gboolean
indicator_fade_cb (GtkWidget *widget,
GdkFrameClock *frame_clock,
gpointer user_data)
{
Indicator *indicator = user_data;
gint64 now;
gdouble t;
now = gdk_frame_clock_get_frame_time (frame_clock);
indicator_fade_step (indicator, now);
if (indicator->current_pos == indicator->target_pos)
gtk_progress_tracker_advance_frame (&indicator->tracker,
gdk_frame_clock_get_frame_time (frame_clock));
t = gtk_progress_tracker_get_ease_out_cubic (&indicator->tracker, FALSE);
indicator_set_fade (indicator,
indicator->source_pos + (t * (indicator->target_pos - indicator->source_pos)));
if (gtk_progress_tracker_get_state (&indicator->tracker) == GTK_PROGRESS_STATE_AFTER)
{
indicator->tick_id = 0;
return FALSE;
@ -4065,12 +4047,9 @@ indicator_start_fade (Indicator *indicator,
if (gtk_widget_get_mapped (indicator->scrollbar) && animations_enabled)
{
indicator->source_pos = indicator->current_pos;
indicator->start_time = gdk_frame_clock_get_frame_time (gtk_widget_get_frame_clock (indicator->scrollbar));
indicator->end_time = indicator->start_time + INDICATOR_FADE_OUT_DURATION * 1000;
gtk_progress_tracker_start (&indicator->tracker, INDICATOR_FADE_OUT_DURATION * 1000, 0, 1.0);
if (indicator->tick_id == 0)
indicator->tick_id = gtk_widget_add_tick_callback (indicator->scrollbar, indicator_fade_cb, indicator, NULL);
indicator_fade_step (indicator, indicator->start_time);
}
else
indicator_set_fade (indicator, target);
@ -4093,8 +4072,9 @@ indicator_stop_fade (Indicator *indicator)
}
gdk_window_hide (indicator->window);
gtk_progress_tracker_finish (&indicator->tracker);
indicator->current_pos = indicator->source_pos = indicator->target_pos = 0;
indicator->start_time = indicator->end_time = indicator->last_scroll_time = 0;
indicator->last_scroll_time = 0;
}
static gboolean
@ -4297,8 +4277,9 @@ indicator_reset (Indicator *indicator)
indicator->scrollbar = NULL;
indicator->over = FALSE;
gtk_progress_tracker_finish (&indicator->tracker);
indicator->current_pos = indicator->source_pos = indicator->target_pos = 0;
indicator->start_time = indicator->end_time = indicator->last_scroll_time = 0;
indicator->last_scroll_time = 0;
}
static void