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Scrolling with mouse

master
Yevgen Muntyan 2005-08-07 16:51:13 +00:00
parent 96d983ee99
commit 2160110135
1 changed files with 60 additions and 22 deletions
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80
moo/mooutils/mooiconview.c
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@ -16,6 +16,7 @@
#include "mooutils/moosignal.h"
#include <gdk/gdkkeysyms.h>
#include <string.h>
#include <math.h>
typedef struct _Column Column;
@ -96,6 +97,8 @@ static gboolean moo_icon_view_expose (GtkWidget *widget,
static gboolean moo_icon_view_button_press (GtkWidget *widget,
GdkEventButton *event);
static gboolean moo_icon_view_scroll_event (GtkWidget *widget,
GdkEventScroll *event);
static void row_changed (GtkTreeModel *model,
GtkTreePath *path,
@ -127,6 +130,8 @@ static void moo_icon_view_set_scroll_adjustments
static void moo_icon_view_update_adjustment (MooIconView *view);
static void moo_icon_view_scroll_to (MooIconView *view,
int offset);
static int clamp_offset (MooIconView *view,
int offset);
static void moo_icon_view_invalidate_layout (MooIconView *view);
static gboolean moo_icon_view_update_layout (MooIconView *view);
@ -185,6 +190,7 @@ static void moo_icon_view_class_init (MooIconViewClass *klass)
widget_class->size_allocate = moo_icon_view_size_allocate;
widget_class->expose_event = moo_icon_view_expose;
widget_class->button_press_event = moo_icon_view_button_press;
widget_class->scroll_event = moo_icon_view_scroll_event;
klass->set_scroll_adjustments = moo_icon_view_set_scroll_adjustments;
@ -1055,7 +1061,6 @@ static gboolean moo_icon_view_update_layout (MooIconView *view)
gboolean finish;
GSList *l;
int column_index;
Column *last_column;
view->priv->update_idle = 0;
gtk_widget_queue_draw (GTK_WIDGET (view));
@ -1114,17 +1119,7 @@ static gboolean moo_icon_view_update_layout (MooIconView *view)
layout->columns = g_slist_append (layout->columns, column);
}
if (layout->width <= GTK_WIDGET(view)->allocation.width)
{
view->priv->xoffset = 0;
}
else
{
last_column = g_slist_last (layout->columns)->data;
view->priv->xoffset = CLAMP (view->priv->xoffset, 0,
layout->width - widget->allocation.width - 1);
}
view->priv->xoffset = clamp_offset (view, view->priv->xoffset);
moo_icon_view_update_adjustment (view);
return FALSE;
}
@ -2024,17 +2019,15 @@ static void moo_icon_view_scroll_to (MooIconView *view,
int offset)
{
g_return_if_fail (GTK_WIDGET_REALIZED (view));
g_return_if_fail (offset >= 0);
g_return_if_fail (view->priv->layout->columns != NULL);
g_return_if_fail (offset < view->priv->layout->width -
GTK_WIDGET(view)->allocation.width);
offset = clamp_offset (view, offset);
if (offset == view->priv->xoffset)
return;
gdk_window_scroll (GTK_WIDGET(view)->window, - offset + view->priv->xoffset, 0);
gdk_window_scroll (GTK_WIDGET(view)->window, view->priv->xoffset - offset, 0);
view->priv->xoffset = offset;
moo_icon_view_update_adjustment (view);
}
@ -2062,10 +2055,6 @@ static void move_cursor_to_entry (MooIconView *view,
else if (column->offset + column->width > xoffset + widget->allocation.width)
new_offset = column->offset + column->width - widget->allocation.width;
new_offset = CLAMP (new_offset, 0, view->priv->layout->width -
GTK_WIDGET(view)->allocation.width - 1);
if (new_offset != xoffset)
moo_icon_view_scroll_to (view, new_offset);
}
@ -2078,3 +2067,52 @@ GtkTreePath *moo_icon_view_get_selected (MooIconView *view)
else
return NULL;
}
static double get_wheel_delta (MooIconView *view)
{
GtkAdjustment *adj = view->priv->adjustment;
#if 1
return pow (adj->page_size, 2.0 / 3.0);
#else
return adj->step_increment * 2;
#endif
}
static gboolean moo_icon_view_scroll_event (GtkWidget *widget,
GdkEventScroll *event)
{
MooIconView *view = MOO_ICON_VIEW (widget);
int offset = view->priv->xoffset;
switch (event->direction)
{
case GDK_SCROLL_UP:
case GDK_SCROLL_LEFT:
offset -= get_wheel_delta (view);
break;
case GDK_SCROLL_DOWN:
case GDK_SCROLL_RIGHT:
offset += get_wheel_delta (view);
break;
}
moo_icon_view_scroll_to (view, offset);
return TRUE;
}
static int clamp_offset (MooIconView *view,
int offset)
{
int layout_width = view->priv->layout->width;
int width = GTK_WIDGET(view)->allocation.width;
if (layout_width <= width)
return 0;
else
return CLAMP (offset, 0, layout_width - width - 1);
}