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gimp/app/display/gimpdisplayshell-scroll.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdlib.h>
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "display-types.h"
#include "config/gimpdisplayconfig.h"
#include "core/gimpimage.h"
#include "gimpcanvas.h"
#include "gimpdisplay.h"
#include "gimpdisplay-foreach.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-expose.h"
#include "gimpdisplayshell-rotate.h"
#include "gimpdisplayshell-scale.h"
#include "gimpdisplayshell-scroll.h"
#define OVERPAN_FACTOR 0.5
#define MINIMUM_STEP_AMOUNT 1.0
typedef struct
{
GimpDisplayShell *shell;
gboolean vertically;
gboolean horizontally;
} SizeAllocateCallbackData;
/**
* gimp_display_shell_scroll_center_image_coordinate:
* @shell:
* @image_x:
* @image_y:
*
* Center the viewport around the passed image coordinate
*
**/
void
gimp_display_shell_scroll_center_image_coordinate (GimpDisplayShell *shell,
gdouble image_x,
gdouble image_y)
{
gint scaled_image_x;
gint scaled_image_y;
gint offset_to_apply_x;
gint offset_to_apply_y;
scaled_image_x = RINT (image_x * shell->scale_x);
scaled_image_y = RINT (image_y * shell->scale_y);
offset_to_apply_x = scaled_image_x - shell->disp_width / 2 - shell->offset_x;
offset_to_apply_y = scaled_image_y - shell->disp_height / 2 - shell->offset_y;
gimp_display_shell_scroll (shell,
offset_to_apply_x,
offset_to_apply_y);
}
void
gimp_display_shell_scroll (GimpDisplayShell *shell,
gint x_offset,
gint y_offset)
{
gint old_x;
gint old_y;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (x_offset == 0 && y_offset == 0)
return;
old_x = shell->offset_x;
old_y = shell->offset_y;
shell->offset_x += x_offset;
shell->offset_y += y_offset;
gimp_display_shell_scroll_clamp_offsets (shell);
/* the actual changes in offset */
x_offset = (shell->offset_x - old_x);
y_offset = (shell->offset_y - old_y);
if (x_offset || y_offset)
{
/* reset the old values so that the tool can accurately redraw */
shell->offset_x = old_x;
shell->offset_y = old_y;
gimp_display_shell_pause (shell);
/* set the offsets back to the new values */
shell->offset_x += x_offset;
shell->offset_y += y_offset;
gimp_display_shell_rotate_update_transform (shell);
gimp_overlay_box_scroll (GIMP_OVERLAY_BOX (shell->canvas),
-x_offset, -y_offset);
/* Update scrollbars and rulers */
gimp_display_shell_scale_update_scrollbars (shell);
gimp_display_shell_scale_update_rulers (shell);
gimp_display_shell_resume (shell);
gimp_display_shell_scrolled (shell);
}
}
void
gimp_display_shell_scroll_set_offset (GimpDisplayShell *shell,
gint offset_x,
gint offset_y)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (shell->offset_x == offset_x &&
shell->offset_y == offset_y)
return;
gimp_display_shell_scale_handle_zoom_revert (shell);
/* freeze the active tool */
gimp_display_shell_pause (shell);
shell->offset_x = offset_x;
shell->offset_y = offset_y;
gimp_display_shell_scroll_clamp_and_update (shell);
gimp_display_shell_scrolled (shell);
gimp_display_shell_expose_full (shell);
/* re-enable the active tool */
gimp_display_shell_resume (shell);
}
void
gimp_display_shell_scroll_clamp_offsets (GimpDisplayShell *shell)
{
GimpImage *image;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
image = gimp_display_get_image (shell->display);
if (image)
{
gint sw, sh;
gint min_offset_x;
gint max_offset_x;
gint min_offset_y;
gint max_offset_y;
sw = SCALEX (shell, gimp_image_get_width (image));
sh = SCALEY (shell, gimp_image_get_height (image));
if (shell->disp_width < sw)
{
min_offset_x = 0 - shell->disp_width * OVERPAN_FACTOR;
max_offset_x = sw - shell->disp_width * (1.0 - OVERPAN_FACTOR);
}
else
{
gint overpan_amount;
overpan_amount = shell->disp_width - sw * (1.0 - OVERPAN_FACTOR);
min_offset_x = 0 - overpan_amount;
max_offset_x = sw + overpan_amount - shell->disp_width;
}
if (shell->disp_height < sh)
{
min_offset_y = 0 - shell->disp_height * OVERPAN_FACTOR;
max_offset_y = sh - shell->disp_height * (1.0 - OVERPAN_FACTOR);
}
else
{
gint overpan_amount;
overpan_amount = shell->disp_height - sh * (1.0 - OVERPAN_FACTOR);
min_offset_y = 0 - overpan_amount;
max_offset_y = sh + overpan_amount - shell->disp_height;
}
/* Handle scrollbar stepper sensitiity */
gtk_range_set_lower_stepper_sensitivity (GTK_RANGE (shell->hsb),
min_offset_x < shell->offset_x ?
GTK_SENSITIVITY_ON :
GTK_SENSITIVITY_OFF);
gtk_range_set_upper_stepper_sensitivity (GTK_RANGE (shell->hsb),
max_offset_x > shell->offset_x ?
GTK_SENSITIVITY_ON :
GTK_SENSITIVITY_OFF);
gtk_range_set_lower_stepper_sensitivity (GTK_RANGE (shell->vsb),
min_offset_y < shell->offset_y ?
GTK_SENSITIVITY_ON :
GTK_SENSITIVITY_OFF);
gtk_range_set_upper_stepper_sensitivity (GTK_RANGE (shell->vsb),
max_offset_y > shell->offset_y ?
GTK_SENSITIVITY_ON :
GTK_SENSITIVITY_OFF);
/* Clamp */
shell->offset_x = CLAMP (shell->offset_x, min_offset_x, max_offset_x);
shell->offset_y = CLAMP (shell->offset_y, min_offset_y, max_offset_y);
}
else
{
shell->offset_x = 0;
shell->offset_y = 0;
}
}
/**
* gimp_display_shell_scroll_clamp_and_update:
* @shell:
*
* Helper function for calling two functions that are commonly called
* in pairs.
**/
void
gimp_display_shell_scroll_clamp_and_update (GimpDisplayShell *shell)
{
gimp_display_shell_scroll_clamp_offsets (shell);
gimp_display_shell_scale_update_scrollbars (shell);
gimp_display_shell_scale_update_rulers (shell);
}
/**
* gimp_display_shell_scroll_unoverscrollify:
* @shell:
* @in_offset_x:
* @in_offset_y:
* @out_offset_x:
* @out_offset_y:
*
* Takes a scroll offset and returns the offset that will not result
* in a scroll beyond the image border. If the image is already
* overscrolled, the return value is 0 for that given axis.
*
**/
void
gimp_display_shell_scroll_unoverscrollify (GimpDisplayShell *shell,
gint in_offset_x,
gint in_offset_y,
gint *out_offset_x,
gint *out_offset_y)
{
gint sw, sh;
gint out_offset_x_dummy, out_offset_y_dummy;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (! out_offset_x) out_offset_x = &out_offset_x_dummy;
if (! out_offset_y) out_offset_y = &out_offset_y_dummy;
*out_offset_x = in_offset_x;
*out_offset_y = in_offset_y;
gimp_display_shell_scale_get_image_size (shell, &sw, &sh);
if (in_offset_x < 0)
{
*out_offset_x = MAX (in_offset_x,
MIN (0, 0 - shell->offset_x));
}
else if (in_offset_x > 0)
{
gint min_offset = sw - shell->disp_width;
*out_offset_x = MIN (in_offset_x,
MAX (0, min_offset - shell->offset_x));
}
if (in_offset_y < 0)
{
*out_offset_y = MAX (in_offset_y,
MIN (0, 0 - shell->offset_y));
}
else if (in_offset_y > 0)
{
gint min_offset = sh - shell->disp_height;
*out_offset_y = MIN (in_offset_y,
MAX (0, min_offset - shell->offset_y));
}
}
/**
* gimp_display_shell_scroll_center_image:
* @shell:
* @horizontally:
* @vertically:
*
* Centers the image in the display shell on the desired axes.
*
**/
void
gimp_display_shell_scroll_center_image (GimpDisplayShell *shell,
gboolean horizontally,
gboolean vertically)
{
gint sw, sh;
gint target_offset_x, target_offset_y;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (! shell->display ||
! gimp_display_get_image (shell->display) ||
(! vertically && ! horizontally))
return;
target_offset_x = shell->offset_x;
target_offset_y = shell->offset_y;
gimp_display_shell_scale_get_image_size (shell, &sw, &sh);
if (horizontally)
{
target_offset_x = (sw - shell->disp_width) / 2;
}
if (vertically)
{
target_offset_y = (sh - shell->disp_height) / 2;
}
gimp_display_shell_scroll_set_offset (shell,
target_offset_x,
target_offset_y);
}
static void
gimp_display_shell_scroll_center_image_callback (GtkWidget *canvas,
GtkAllocation *allocation,
SizeAllocateCallbackData *data)
{
gimp_display_shell_scroll_center_image (data->shell,
data->horizontally,
data->vertically);
g_signal_handlers_disconnect_by_func (canvas,
gimp_display_shell_scroll_center_image_callback,
data);
g_slice_free (SizeAllocateCallbackData, data);
}
/**
* gimp_display_shell_scroll_center_image_on_next_size_allocate:
* @shell:
*
* Centers the image in the display as soon as the canvas has got its
* new size.
*
* Only call this if you are sure the canvas size will change.
* (Otherwise the signal connection and centering will lurk until the
* canvas size is changed e.g. by toggling the rulers.)
*
**/
void
gimp_display_shell_scroll_center_image_on_next_size_allocate (GimpDisplayShell *shell,
gboolean horizontally,
gboolean vertically)
{
SizeAllocateCallbackData *data;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
data = g_slice_new (SizeAllocateCallbackData);
if (data)
{
data->shell = shell;
data->horizontally = horizontally;
data->vertically = vertically;
g_signal_connect (shell->canvas, "size-allocate",
G_CALLBACK (gimp_display_shell_scroll_center_image_callback),
data);
}
}
/**
* gimp_display_shell_scroll_get_scaled_viewport:
* @shell:
* @x:
* @y:
* @w:
* @h:
*
* Gets the viewport in screen coordinates, with origin at (0, 0) in
* the image
*
**/
void
gimp_display_shell_scroll_get_scaled_viewport (const GimpDisplayShell *shell,
gint *x,
gint *y,
gint *w,
gint *h)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
*x = shell->offset_x;
*y = shell->offset_y;
*w = shell->disp_width;
*h = shell->disp_height;
}
/**
* gimp_display_shell_scroll_get_viewport:
* @shell:
* @x:
* @y:
* @w:
* @h:
*
* Gets the viewport in image coordinates
*
**/
void
gimp_display_shell_scroll_get_viewport (const GimpDisplayShell *shell,
gdouble *x,
gdouble *y,
gdouble *w,
gdouble *h)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
*x = shell->offset_x / shell->scale_x;
*y = shell->offset_y / shell->scale_y;
*w = shell->disp_width / shell->scale_x;
*h = shell->disp_height / shell->scale_y;
}
/**
* gimp_display_shell_scroll_setup_hscrollbar:
* @shell:
* @value:
*
* Setup the limits of the horizontal scrollbar
*
**/
void
gimp_display_shell_scroll_setup_hscrollbar (GimpDisplayShell *shell,
gdouble value)
{
gint sw;
gdouble lower;
gdouble upper;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (! shell->display ||
! gimp_display_get_image (shell->display))
return;
gimp_display_shell_scale_get_image_size (shell, &sw, NULL);
if (shell->disp_width < sw)
{
lower = MIN (value, 0);
upper = MAX (value + shell->disp_width, sw);
}
else
{
lower = MIN (value, -(shell->disp_width - sw) / 2);
upper = MAX (value + shell->disp_width,
sw + (shell->disp_width - sw) / 2);
}
g_object_set (shell->hsbdata,
"lower", lower,
"upper", upper,
"step-increment", (gdouble) MAX (shell->scale_x,
MINIMUM_STEP_AMOUNT),
NULL);
}
/**
* gimp_display_shell_scroll_setup_vscrollbar:
* @shell:
* @value:
*
* Setup the limits of the vertical scrollbar
*
**/
void
gimp_display_shell_scroll_setup_vscrollbar (GimpDisplayShell *shell,
gdouble value)
{
gint sh;
gdouble lower;
gdouble upper;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (! shell->display ||
! gimp_display_get_image (shell->display))
return;
gimp_display_shell_scale_get_image_size (shell, NULL, &sh);
if (shell->disp_height < sh)
{
lower = MIN (value, 0);
upper = MAX (value + shell->disp_height, sh);
}
else
{
lower = MIN (value, -(shell->disp_height - sh) / 2);
upper = MAX (value + shell->disp_height,
sh + (shell->disp_height - sh) / 2);
}
g_object_set (shell->vsbdata,
"lower", lower,
"upper", upper,
"step-increment", (gdouble) MAX (shell->scale_y,
MINIMUM_STEP_AMOUNT),
NULL);
}
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