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PIKApp/libpikawidgets/pikascrolledpreview.c

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/* LIBPIKA - The PIKA Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* pikascrolledpreview.c
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "libpikamath/pikamath.h"
#include "pikawidgetstypes.h"
#include "pikaicons.h"
#include "pikapreviewarea.h"
#include "pikascrolledpreview.h"
#include "libpika/libpika-intl.h"
/**
* SECTION: pikascrolledpreview
* @title: PikaScrolledPreview
* @short_description: A widget providing a #PikaPreview enhanced by
* scrolling capabilities.
*
* A widget providing a #PikaPreview enhanced by scrolling capabilities.
**/
#define POPUP_SIZE 100
struct _PikaScrolledPreviewPrivate
{
GtkWidget *hscr;
GtkWidget *vscr;
GtkWidget *nav_icon;
GtkWidget *nav_popup;
GdkCursor *cursor_move;
GtkPolicyType hscr_policy;
GtkPolicyType vscr_policy;
gint drag_xoff;
gint drag_yoff;
gboolean in_drag;
gint frozen;
};
#define GET_PRIVATE(obj) (pika_scrolled_preview_get_instance_private ((PikaScrolledPreview *) (obj)))
static void pika_scrolled_preview_dispose (GObject *object);
static void pika_scrolled_preview_drag_begin (GtkGestureDrag *gesture,
gdouble start_x,
gdouble start_y,
gpointer user_data);
static void pika_scrolled_preview_drag_update (GtkGestureDrag *gesture,
gdouble offset_x,
gdouble offset_y,
gpointer user_data);
static void pika_scrolled_preview_drag_end (GtkGestureDrag *gesture,
gdouble offset_x,
gdouble offset_y,
gpointer user_data);
static void pika_scrolled_preview_drag_cancel (GtkGesture *gesture,
GdkEventSequence *sequence,
gpointer user_data);
static void pika_scrolled_preview_area_realize (GtkWidget *widget,
PikaScrolledPreview *preview);
static void pika_scrolled_preview_area_unrealize (GtkWidget *widget,
PikaScrolledPreview *preview);
static void pika_scrolled_preview_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
PikaScrolledPreview *preview);
static gboolean pika_scrolled_preview_area_event (GtkWidget *area,
GdkEvent *event,
PikaScrolledPreview *preview);
static void pika_scrolled_preview_h_scroll (GtkAdjustment *hadj,
PikaPreview *preview);
static void pika_scrolled_preview_v_scroll (GtkAdjustment *vadj,
PikaPreview *preview);
static gboolean pika_scrolled_preview_nav_button_press (GtkWidget *widget,
GdkEventButton *event,
PikaScrolledPreview *preview);
static gboolean pika_scrolled_preview_nav_popup_event (GtkWidget *widget,
GdkEvent *event,
PikaScrolledPreview *preview);
static gboolean pika_scrolled_preview_nav_popup_draw (GtkWidget *widget,
cairo_t *cr,
PikaScrolledPreview *preview);
static void pika_scrolled_preview_set_cursor (PikaPreview *preview);
G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (PikaScrolledPreview, pika_scrolled_preview,
PIKA_TYPE_PREVIEW)
#define parent_class pika_scrolled_preview_parent_class
static void
pika_scrolled_preview_class_init (PikaScrolledPreviewClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaPreviewClass *preview_class = PIKA_PREVIEW_CLASS (klass);
object_class->dispose = pika_scrolled_preview_dispose;
preview_class->set_cursor = pika_scrolled_preview_set_cursor;
}
static void
pika_scrolled_preview_init (PikaScrolledPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
GtkWidget *image;
GtkWidget *grid;
GtkWidget *area;
GtkGesture *gesture;
GtkAdjustment *adj;
gint width;
gint height;
priv->nav_popup = NULL;
priv->hscr_policy = GTK_POLICY_AUTOMATIC;
priv->vscr_policy = GTK_POLICY_AUTOMATIC;
priv->in_drag = FALSE;
priv->frozen = 1; /* we are frozen during init */
grid = pika_preview_get_grid (PIKA_PREVIEW (preview));
pika_preview_get_size (PIKA_PREVIEW (preview), &width, &height);
/* scrollbars */
adj = gtk_adjustment_new (0, 0, width - 1, 1.0, width, width);
g_signal_connect (adj, "value-changed",
G_CALLBACK (pika_scrolled_preview_h_scroll),
preview);
priv->hscr = gtk_scrollbar_new (GTK_ORIENTATION_HORIZONTAL, adj);
gtk_widget_set_hexpand (priv->hscr, TRUE);
gtk_grid_attach (GTK_GRID (grid), priv->hscr, 0, 1, 1, 1);
adj = gtk_adjustment_new (0, 0, height - 1, 1.0, height, height);
g_signal_connect (adj, "value-changed",
G_CALLBACK (pika_scrolled_preview_v_scroll),
preview);
priv->vscr = gtk_scrollbar_new (GTK_ORIENTATION_VERTICAL, adj);
gtk_widget_set_vexpand (priv->vscr, TRUE);
gtk_grid_attach (GTK_GRID (grid), priv->vscr, 1, 0, 1, 1);
area = pika_preview_get_area (PIKA_PREVIEW (preview));
/* Connect after here so that plug-ins get a chance to override the
* default behavior. See bug #364432.
*/
g_signal_connect_after (area, "event",
G_CALLBACK (pika_scrolled_preview_area_event),
preview);
/* Allow the user to drag the rectangle on the preview */
gesture = gtk_gesture_drag_new (GTK_WIDGET (preview));
g_signal_connect (gesture, "drag-begin",
G_CALLBACK (pika_scrolled_preview_drag_begin),
preview);
g_signal_connect (gesture, "drag-update",
G_CALLBACK (pika_scrolled_preview_drag_update),
preview);
g_signal_connect (gesture, "drag-end",
G_CALLBACK (pika_scrolled_preview_drag_end),
preview);
g_signal_connect (gesture, "cancel",
G_CALLBACK (pika_scrolled_preview_drag_cancel),
preview);
g_signal_connect (area, "realize",
G_CALLBACK (pika_scrolled_preview_area_realize),
preview);
g_signal_connect (area, "unrealize",
G_CALLBACK (pika_scrolled_preview_area_unrealize),
preview);
g_signal_connect (area, "size-allocate",
G_CALLBACK (pika_scrolled_preview_area_size_allocate),
preview);
/* navigation icon */
priv->nav_icon = gtk_event_box_new ();
gtk_grid_attach (GTK_GRID (grid), priv->nav_icon, 1, 1, 1, 1);
image = gtk_image_new_from_icon_name (PIKA_ICON_DIALOG_NAVIGATION,
GTK_ICON_SIZE_MENU);
gtk_container_add (GTK_CONTAINER (priv->nav_icon), image);
gtk_widget_show (image);
g_signal_connect (priv->nav_icon, "button-press-event",
G_CALLBACK (pika_scrolled_preview_nav_button_press),
preview);
priv->frozen = 0; /* thaw without actually calling draw/invalidate */
}
static void
pika_scrolled_preview_dispose (GObject *object)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (object);
g_clear_pointer (&priv->nav_popup, gtk_widget_destroy);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
pika_scrolled_preview_drag_begin (GtkGestureDrag *gesture,
gdouble start_x,
gdouble start_y,
gpointer user_data)
{
PikaScrolledPreview *preview = PIKA_SCROLLED_PREVIEW (user_data);
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
priv->in_drag = TRUE;
pika_preview_get_offsets (PIKA_PREVIEW (preview),
&priv->drag_xoff, &priv->drag_yoff);
}
static void
pika_scrolled_preview_drag_update (GtkGestureDrag *gesture,
gdouble offset_x,
gdouble offset_y,
gpointer user_data)
{
PikaScrolledPreview *preview = PIKA_SCROLLED_PREVIEW (user_data);
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
GtkAdjustment *hadj;
GtkAdjustment *vadj;
gint x, y;
gint xoff, yoff;
hadj = gtk_range_get_adjustment (GTK_RANGE (priv->hscr));
vadj = gtk_range_get_adjustment (GTK_RANGE (priv->vscr));
x = priv->drag_xoff - (int) offset_x;
y = priv->drag_yoff - (int) offset_y;
x = CLAMP (x,
gtk_adjustment_get_lower (hadj),
gtk_adjustment_get_upper (hadj) -
gtk_adjustment_get_page_size (hadj));
y = CLAMP (y,
gtk_adjustment_get_lower (vadj),
gtk_adjustment_get_upper (vadj) -
gtk_adjustment_get_page_size (vadj));
pika_preview_get_offsets (PIKA_PREVIEW (preview), &xoff, &yoff);
if (xoff == x && yoff == y)
return;
gtk_adjustment_set_value (hadj, x);
gtk_adjustment_set_value (vadj, y);
pika_preview_draw (PIKA_PREVIEW (preview));
pika_preview_invalidate (PIKA_PREVIEW (preview));
}
static void
pika_scrolled_preview_drag_end (GtkGestureDrag *gesture,
gdouble offset_x,
gdouble offset_y,
gpointer user_data)
{
PikaScrolledPreview *preview = PIKA_SCROLLED_PREVIEW (user_data);
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
priv->in_drag = FALSE;
}
static void
pika_scrolled_preview_drag_cancel (GtkGesture *gesture,
GdkEventSequence *sequence,
gpointer user_data)
{
PikaScrolledPreview *preview = PIKA_SCROLLED_PREVIEW (user_data);
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
priv->in_drag = FALSE;
}
static void
pika_scrolled_preview_area_realize (GtkWidget *widget,
PikaScrolledPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
GdkDisplay *display = gtk_widget_get_display (widget);
g_return_if_fail (priv->cursor_move == NULL);
priv->cursor_move = gdk_cursor_new_for_display (display, GDK_HAND1);
}
static void
pika_scrolled_preview_area_unrealize (GtkWidget *widget,
PikaScrolledPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
g_clear_object (&priv->cursor_move);
}
static void
pika_scrolled_preview_hscr_update (PikaScrolledPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
GtkAdjustment *adj;
gint xmin, xmax;
gint width;
adj = gtk_range_get_adjustment (GTK_RANGE (priv->hscr));
pika_preview_get_bounds (PIKA_PREVIEW (preview), &xmin, NULL, &xmax, NULL);
pika_preview_get_size (PIKA_PREVIEW (preview), &width, NULL);
gtk_adjustment_configure (adj,
gtk_adjustment_get_value (adj),
0, xmax - xmin,
1.0,
MAX (width / 2.0, 1.0),
width);
}
static void
pika_scrolled_preview_vscr_update (PikaScrolledPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
GtkAdjustment *adj;
gint ymin, ymax;
gint height;
adj = gtk_range_get_adjustment (GTK_RANGE (priv->vscr));
pika_preview_get_bounds (PIKA_PREVIEW (preview), NULL, &ymin, NULL, &ymax);
pika_preview_get_size (PIKA_PREVIEW (preview), NULL, &height);
gtk_adjustment_configure (adj,
gtk_adjustment_get_value (adj),
0, ymax - ymin,
1.0,
MAX (height / 2.0, 1.0),
height);
}
static void
pika_scrolled_preview_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
PikaScrolledPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
gint xmin, ymin;
gint xmax, ymax;
gint width;
gint height;
pika_preview_get_bounds (PIKA_PREVIEW (preview), &xmin, &ymin, &xmax, &ymax);
pika_preview_get_size (PIKA_PREVIEW (preview), &width, &height);
pika_scrolled_preview_freeze (preview);
#if 0
PIKA_PREVIEW (preview)->width = MIN (xmax - xmin, allocation->width);
PIKA_PREVIEW (preview)->height = MIN (ymax - ymin, allocation->height);
#endif
pika_scrolled_preview_hscr_update (preview);
switch (priv->hscr_policy)
{
case GTK_POLICY_AUTOMATIC:
gtk_widget_set_visible (priv->hscr, xmax - xmin > width);
break;
case GTK_POLICY_ALWAYS:
gtk_widget_show (priv->hscr);
break;
case GTK_POLICY_NEVER:
case GTK_POLICY_EXTERNAL:
gtk_widget_hide (priv->hscr);
break;
}
pika_scrolled_preview_vscr_update (preview);
switch (priv->vscr_policy)
{
case GTK_POLICY_AUTOMATIC:
gtk_widget_set_visible (priv->vscr, ymax - ymin > height);
break;
case GTK_POLICY_ALWAYS:
gtk_widget_show (priv->vscr);
break;
case GTK_POLICY_NEVER:
case GTK_POLICY_EXTERNAL:
gtk_widget_hide (priv->vscr);
break;
}
gtk_widget_set_visible (priv->nav_icon,
gtk_widget_get_visible (priv->vscr) &&
gtk_widget_get_visible (priv->hscr) &&
PIKA_PREVIEW_GET_CLASS (preview)->draw_thumb);
pika_scrolled_preview_thaw (preview);
}
static gboolean
pika_scrolled_preview_area_event (GtkWidget *area,
GdkEvent *event,
PikaScrolledPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
if (event->type == GDK_SCROLL)
{
GdkEventScroll *sevent = (GdkEventScroll *) event;
GtkAdjustment *adj_x;
GtkAdjustment *adj_y;
gdouble value_x;
gdouble value_y;
/* Ctrl-Scroll is reserved for zooming */
if (sevent->state & GDK_CONTROL_MASK)
return FALSE;
adj_x = gtk_range_get_adjustment (GTK_RANGE (priv->hscr));
adj_y = gtk_range_get_adjustment (GTK_RANGE (priv->vscr));
pika_scroll_adjustment_values (sevent,
adj_x, adj_y,
&value_x, &value_y);
gtk_adjustment_set_value (adj_x, value_x);
gtk_adjustment_set_value (adj_y, value_y);
}
return FALSE;
}
static void
pika_scrolled_preview_h_scroll (GtkAdjustment *hadj,
PikaPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
GtkWidget *area;
gint xoff, yoff;
pika_preview_get_offsets (preview, NULL, &yoff);
xoff = gtk_adjustment_get_value (hadj);
pika_preview_set_offsets (preview, xoff, yoff);
area = pika_preview_get_area (preview);
pika_preview_area_set_offsets (PIKA_PREVIEW_AREA (area), xoff, yoff);
if (! (priv->in_drag || priv->frozen))
{
pika_preview_draw (preview);
pika_preview_invalidate (preview);
}
}
static void
pika_scrolled_preview_v_scroll (GtkAdjustment *vadj,
PikaPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
GtkWidget *area;
gint xoff, yoff;
pika_preview_get_offsets (preview, &xoff, NULL);
yoff = gtk_adjustment_get_value (vadj);
pika_preview_set_offsets (preview, xoff, yoff);
area = pika_preview_get_area (preview);
pika_preview_area_set_offsets (PIKA_PREVIEW_AREA (area), xoff, yoff);
if (! (priv->in_drag || priv->frozen))
{
pika_preview_draw (preview);
pika_preview_invalidate (preview);
}
}
static gboolean
pika_scrolled_preview_nav_button_press (GtkWidget *widget,
GdkEventButton *event,
PikaScrolledPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
PikaPreview *pika_preview = PIKA_PREVIEW (preview);
GtkAdjustment *adj;
if (priv->nav_popup)
return TRUE;
if (event->type == GDK_BUTTON_PRESS && event->button == 1)
{
GtkStyleContext *context = gtk_widget_get_style_context (widget);
GtkWidget *toplevel;
GtkWidget *outer;
GtkWidget *inner;
GtkWidget *area;
GdkCursor *cursor;
GtkBorder border;
PikaCheckType check_type;
PikaRGB check_custom_color1;
PikaRGB check_custom_color2;
gint area_width;
gint area_height;
gint x, y;
gdouble h, v;
priv->nav_popup = gtk_window_new (GTK_WINDOW_POPUP);
toplevel = gtk_widget_get_toplevel (GTK_WIDGET (preview));
if (GTK_IS_WINDOW (toplevel))
{
gtk_window_set_transient_for (GTK_WINDOW (priv->nav_popup),
GTK_WINDOW (toplevel));
}
gtk_window_set_screen (GTK_WINDOW (priv->nav_popup),
gtk_widget_get_screen (widget));
outer = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (outer), GTK_SHADOW_OUT);
gtk_container_add (GTK_CONTAINER (priv->nav_popup), outer);
gtk_widget_show (outer);
inner = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (inner), GTK_SHADOW_IN);
gtk_container_add (GTK_CONTAINER (outer), inner);
gtk_widget_show (inner);
g_object_get (pika_preview_get_area (pika_preview),
"check-type", &check_type,
"check-custom-color1", &check_custom_color1,
"check-custom-color2", &check_custom_color2,
NULL);
area = g_object_new (PIKA_TYPE_PREVIEW_AREA,
"check-size", PIKA_CHECK_SIZE_SMALL_CHECKS,
"check-type", check_type,
"check-custom-color1", check_custom_color1,
"check-custom-color2", check_custom_color2,
NULL);
gtk_container_add (GTK_CONTAINER (inner), area);
g_signal_connect (area, "event",
G_CALLBACK (pika_scrolled_preview_nav_popup_event),
preview);
g_signal_connect_after (area, "draw",
G_CALLBACK (pika_scrolled_preview_nav_popup_draw),
preview);
PIKA_PREVIEW_GET_CLASS (preview)->draw_thumb (pika_preview,
PIKA_PREVIEW_AREA (area),
POPUP_SIZE, POPUP_SIZE);
gtk_widget_realize (area);
gtk_widget_show (area);
gdk_window_get_origin (gtk_widget_get_window (widget), &x, &y);
adj = gtk_range_get_adjustment (GTK_RANGE (priv->hscr));
h = ((gtk_adjustment_get_value (adj) /
gtk_adjustment_get_upper (adj)) +
(gtk_adjustment_get_page_size (adj) /
gtk_adjustment_get_upper (adj)) / 2.0);
adj = gtk_range_get_adjustment (GTK_RANGE (priv->vscr));
v = ((gtk_adjustment_get_value (adj) /
gtk_adjustment_get_upper (adj)) +
(gtk_adjustment_get_page_size (adj) /
gtk_adjustment_get_upper (adj)) / 2.0);
pika_preview_area_get_size (PIKA_PREVIEW_AREA (area),
&area_width, &area_height);
x += event->x - h * (gdouble) area_width;
y += event->y - v * (gdouble) area_height;
gtk_style_context_get_border (context,
gtk_style_context_get_state (context),
&border);
gtk_window_move (GTK_WINDOW (priv->nav_popup),
x - (border.left + border.right),
y - (border.top + border.bottom));
gtk_widget_show (priv->nav_popup);
gtk_grab_add (area);
cursor = gdk_cursor_new_for_display (gtk_widget_get_display (widget),
GDK_FLEUR);
gdk_seat_grab (gdk_display_get_default_seat (gtk_widget_get_display (widget)),
gtk_widget_get_window (area),
GDK_SEAT_CAPABILITY_ALL_POINTING, TRUE,
cursor, (GdkEvent *) event,
NULL, NULL);
g_object_unref (cursor);
}
return TRUE;
}
static gboolean
pika_scrolled_preview_nav_popup_event (GtkWidget *widget,
GdkEvent *event,
PikaScrolledPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
switch (event->type)
{
case GDK_BUTTON_RELEASE:
{
GdkEventButton *button_event = (GdkEventButton *) event;
if (button_event->button == 1)
{
GdkSeat *seat = gdk_display_get_default_seat (gtk_widget_get_display (widget));
gtk_grab_remove (widget);
gdk_seat_ungrab (seat);
gtk_widget_destroy (priv->nav_popup);
priv->nav_popup = NULL;
}
}
break;
case GDK_MOTION_NOTIFY:
{
GdkEventMotion *mevent = (GdkEventMotion *) event;
GtkAdjustment *hadj;
GtkAdjustment *vadj;
GtkAllocation allocation;
gint cx, cy;
gdouble x, y;
hadj = gtk_range_get_adjustment (GTK_RANGE (priv->hscr));
vadj = gtk_range_get_adjustment (GTK_RANGE (priv->vscr));
gtk_widget_get_allocation (widget, &allocation);
gdk_window_get_device_position (gtk_widget_get_window (widget),
gdk_event_get_device (event),
&cx, &cy, NULL);
x = cx * (gtk_adjustment_get_upper (hadj) -
gtk_adjustment_get_lower (hadj)) / allocation.width;
y = cy * (gtk_adjustment_get_upper (vadj) -
gtk_adjustment_get_lower (vadj)) / allocation.height;
x += (gtk_adjustment_get_lower (hadj) -
gtk_adjustment_get_page_size (hadj) / 2);
y += (gtk_adjustment_get_lower (vadj) -
gtk_adjustment_get_page_size (vadj) / 2);
gtk_adjustment_set_value (hadj,
CLAMP (x,
gtk_adjustment_get_lower (hadj),
gtk_adjustment_get_upper (hadj) -
gtk_adjustment_get_page_size (hadj)));
gtk_adjustment_set_value (vadj,
CLAMP (y,
gtk_adjustment_get_lower (vadj),
gtk_adjustment_get_upper (vadj) -
gtk_adjustment_get_page_size (vadj)));
gtk_widget_queue_draw (widget);
gdk_event_request_motions (mevent);
}
break;
default:
break;
}
return FALSE;
}
static gboolean
pika_scrolled_preview_nav_popup_draw (GtkWidget *widget,
cairo_t *cr,
PikaScrolledPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
GtkAdjustment *adj;
GtkAllocation allocation;
gdouble x, y;
gdouble w, h;
adj = gtk_range_get_adjustment (GTK_RANGE (priv->hscr));
gtk_widget_get_allocation (widget, &allocation);
x = (gtk_adjustment_get_value (adj) /
(gtk_adjustment_get_upper (adj) -
gtk_adjustment_get_lower (adj)));
w = (gtk_adjustment_get_page_size (adj) /
(gtk_adjustment_get_upper (adj) -
gtk_adjustment_get_lower (adj)));
adj = gtk_range_get_adjustment (GTK_RANGE (priv->vscr));
y = (gtk_adjustment_get_value (adj) /
(gtk_adjustment_get_upper (adj) -
gtk_adjustment_get_lower (adj)));
h = (gtk_adjustment_get_page_size (adj) /
(gtk_adjustment_get_upper (adj) -
gtk_adjustment_get_lower (adj)));
if (w >= 1.0 && h >= 1.0)
return FALSE;
x = floor (x * (gdouble) allocation.width);
y = floor (y * (gdouble) allocation.height);
w = MAX (1, ceil (w * (gdouble) allocation.width));
h = MAX (1, ceil (h * (gdouble) allocation.height));
cairo_rectangle (cr, 0, 0, allocation.width, allocation.height);
cairo_rectangle (cr, x, y, w, h);
cairo_set_source_rgba (cr, 0, 0, 0, 0.5);
cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
cairo_fill (cr);
cairo_rectangle (cr, x, y, w, h);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_set_line_width (cr, 2);
cairo_stroke (cr);
return FALSE;
}
static void
pika_scrolled_preview_set_cursor (PikaPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
GtkWidget *area;
gint width, height;
gint xmin, ymin;
gint xmax, ymax;
area = pika_preview_get_area (preview);
if (! gtk_widget_get_realized (area))
return;
pika_preview_get_size (preview, &width, &height);
pika_preview_get_bounds (preview, &xmin, &ymin, &xmax, &ymax);
if (xmax - xmin > width ||
ymax - ymin > height)
{
gdk_window_set_cursor (gtk_widget_get_window (area),
priv->cursor_move);
}
else
{
gdk_window_set_cursor (gtk_widget_get_window (area),
pika_preview_get_default_cursor (preview));
}
}
/**
* pika_scrolled_preview_set_position:
* @preview: a #PikaScrolledPreview
* @x: horizontal scroll offset
* @y: vertical scroll offset
*
* Since: 2.4
**/
void
pika_scrolled_preview_set_position (PikaScrolledPreview *preview,
gint x,
gint y)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
GtkAdjustment *adj;
gint xmin, ymin;
g_return_if_fail (PIKA_IS_SCROLLED_PREVIEW (preview));
pika_scrolled_preview_freeze (preview);
pika_scrolled_preview_hscr_update (preview);
pika_scrolled_preview_vscr_update (preview);
pika_preview_get_bounds (PIKA_PREVIEW (preview), &xmin, &ymin, NULL, NULL);
adj = gtk_range_get_adjustment (GTK_RANGE (priv->hscr));
gtk_adjustment_set_value (adj, x - xmin);
adj = gtk_range_get_adjustment (GTK_RANGE (priv->vscr));
gtk_adjustment_set_value (adj, y - ymin);
pika_scrolled_preview_thaw (preview);
}
/**
* pika_scrolled_preview_set_policy
* @preview: a #PikaScrolledPreview
* @hscrollbar_policy: policy for horizontal scrollbar
* @vscrollbar_policy: policy for vertical scrollbar
*
* Since: 2.4
**/
void
pika_scrolled_preview_set_policy (PikaScrolledPreview *preview,
GtkPolicyType hscrollbar_policy,
GtkPolicyType vscrollbar_policy)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
g_return_if_fail (PIKA_IS_SCROLLED_PREVIEW (preview));
priv->hscr_policy = hscrollbar_policy;
priv->vscr_policy = vscrollbar_policy;
gtk_widget_queue_resize (pika_preview_get_area (PIKA_PREVIEW (preview)));
}
/**
* pika_scrolled_preview_get_adjustments:
* @preview: a #PikaScrolledPreview
* @hadj: (out) (transfer none): Horizontal adjustment
* @vadj: (out) (transfer none): Vertical adjustment
*/
void
pika_scrolled_preview_get_adjustments (PikaScrolledPreview *preview,
GtkAdjustment **hadj,
GtkAdjustment **vadj)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
g_return_if_fail (PIKA_IS_SCROLLED_PREVIEW (preview));
if (hadj) *hadj = gtk_range_get_adjustment (GTK_RANGE (priv->hscr));
if (vadj) *vadj = gtk_range_get_adjustment (GTK_RANGE (priv->vscr));
}
/**
* pika_scrolled_preview_freeze:
* @preview: a #PikaScrolledPreview
*
* While the @preview is frozen, it is not going to redraw itself in
* response to scroll events.
*
* This function should only be used to implement widgets derived from
* #PikaScrolledPreview. There is no point in calling this from a plug-in.
*
* Since: 2.4
**/
void
pika_scrolled_preview_freeze (PikaScrolledPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
g_return_if_fail (PIKA_IS_SCROLLED_PREVIEW (preview));
priv->frozen++;
}
/**
* pika_scrolled_preview_thaw:
* @preview: a #PikaScrolledPreview
*
* While the @preview is frozen, it is not going to redraw itself in
* response to scroll events.
*
* This function should only be used to implement widgets derived from
* #PikaScrolledPreview. There is no point in calling this from a plug-in.
*
* Since: 2.4
**/
void
pika_scrolled_preview_thaw (PikaScrolledPreview *preview)
{
PikaScrolledPreviewPrivate *priv = GET_PRIVATE (preview);
g_return_if_fail (PIKA_IS_SCROLLED_PREVIEW (preview));
g_return_if_fail (priv->frozen > 0);
priv->frozen--;
if (! priv->frozen)
{
pika_preview_draw (PIKA_PREVIEW (preview));
pika_preview_invalidate (PIKA_PREVIEW (preview));
}
}
/**
* pika_scroll_adjustment_values:
* @sevent: A #GdkEventScroll
* @hadj: (nullable): Horizontal adjustment
* @vadj: (nullable): Vertical adjustment
* @hvalue: (out) (optional): Return location for horizontal value, or %NULL
* @vvalue: (out) (optional): Return location for vertical value, or %NULL
*/
void
pika_scroll_adjustment_values (GdkEventScroll *sevent,
GtkAdjustment *hadj,
GtkAdjustment *vadj,
gdouble *hvalue,
gdouble *vvalue)
{
GtkAdjustment *adj_x;
GtkAdjustment *adj_y;
gdouble scroll_unit_x;
gdouble scroll_unit_y;
gdouble value_x = 0.0;
gdouble value_y = 0.0;
g_return_if_fail (sevent != NULL);
g_return_if_fail (hadj == NULL || GTK_IS_ADJUSTMENT (hadj));
g_return_if_fail (vadj == NULL || GTK_IS_ADJUSTMENT (vadj));
if (sevent->state & GDK_SHIFT_MASK)
{
adj_x = vadj;
adj_y = hadj;
}
else
{
adj_x = hadj;
adj_y = vadj;
}
if (adj_x)
{
gdouble page_size = gtk_adjustment_get_page_size (adj_x);
gdouble pow_unit = pow (page_size, 2.0 / 3.0);
scroll_unit_x = MIN (page_size / 2.0, pow_unit);
}
else
scroll_unit_x = 1.0;
if (adj_y)
{
gdouble page_size = gtk_adjustment_get_page_size (adj_y);
gdouble pow_unit = pow (page_size, 2.0 / 3.0);
scroll_unit_y = MIN (page_size / 2.0, pow_unit);
}
else
scroll_unit_y = 1.0;
switch (sevent->direction)
{
case GDK_SCROLL_LEFT:
value_x = -scroll_unit_x;
break;
case GDK_SCROLL_RIGHT:
value_x = scroll_unit_x;
break;
case GDK_SCROLL_UP:
value_y = -scroll_unit_y;
break;
case GDK_SCROLL_DOWN:
value_y = scroll_unit_y;
break;
case GDK_SCROLL_SMOOTH:
gdk_event_get_scroll_deltas ((GdkEvent *) sevent, &value_x, &value_y);
value_x *= scroll_unit_x;
value_y *= scroll_unit_y;
}
if (adj_x)
value_x = CLAMP (value_x +
gtk_adjustment_get_value (adj_x),
gtk_adjustment_get_lower (adj_x),
gtk_adjustment_get_upper (adj_x) -
gtk_adjustment_get_page_size (adj_x));
if (adj_y)
value_y = CLAMP (value_y +
gtk_adjustment_get_value (adj_y),
gtk_adjustment_get_lower (adj_y),
gtk_adjustment_get_upper (adj_y) -
gtk_adjustment_get_page_size (adj_y));
if (sevent->state & GDK_SHIFT_MASK)
{
if (hvalue) *hvalue = value_y;
if (vvalue) *vvalue = value_x;
}
else
{
if (hvalue) *hvalue = value_x;
if (vvalue) *vvalue = value_y;
}
}
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