/**
* 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_size_changed_detailed_handler (GimpImage *image,
gint previous_origin_x,
gint previous_origin_y,
gint previous_width,
gint previous_height,
GimpDisplayShell *shell)
{
if (shell->display->config->resize_windows_on_resize)
{
GimpImageWindow *window = gimp_display_shell_get_window (shell);
if (window && gimp_image_window_get_active_shell (window) == shell)
{
/* If the window is resized just center the image in it when it
* has change size
*/
gimp_image_window_shrink_wrap (window, FALSE);
}
}
else
{
GimpImage *image = gimp_display_get_image (shell->display);
gint new_width = gimp_image_get_width (image);
gint new_height = gimp_image_get_height (image);
gint scaled_previous_origin_x = SCALEX (shell, previous_origin_x);
gint scaled_previous_origin_y = SCALEY (shell, previous_origin_y);
gboolean horizontally;
gboolean vertically;
horizontally = (SCALEX (shell, previous_width) > shell->disp_width &&
SCALEX (shell, new_width) <= shell->disp_width);
vertically = (SCALEY (shell, previous_height) > shell->disp_height &&
SCALEY (shell, new_height) <= shell->disp_height);
gimp_display_shell_scroll_set_offset (shell,
shell->offset_x + scaled_previous_origin_x,
shell->offset_y + scaled_previous_origin_y);
gimp_display_shell_scroll_center_image (shell, horizontally, vertically);
/* The above calls might not lead to a call to
* gimp_display_shell_scroll_clamp_and_update() in all cases we
* need it to be called, so simply call it explicitly here at
* the end
*/
gimp_display_shell_scroll_clamp_and_update (shell);
gimp_display_shell_expose_full (shell);
}
}
static void
gimp_display_shell_size_changed_detailed_handler (GimpImage *image,
gint previous_origin_x,
gint previous_origin_y,
gint previous_width,
gint previous_height,
GimpDisplayShell *shell)
{
GimpDisplayConfig *config = shell->display->config;
gboolean resize_window;
/* Resize windows only in multi-window mode */
resize_window = (config->resize_windows_on_resize &&
! GIMP_GUI_CONFIG (config)->single_window_mode);
if (resize_window)
{
GimpImageWindow *window = gimp_display_shell_get_window (shell);
if (window && gimp_image_window_get_active_shell (window) == shell)
{
/* If the window is resized just center the image in it when it
* has change size
*/
gimp_image_window_shrink_wrap (window, FALSE);
}
}
else
{
GimpImage *image = gimp_display_get_image (shell->display);
gint new_width = gimp_image_get_width (image);
gint new_height = gimp_image_get_height (image);
gint scaled_previous_origin_x;
gint scaled_previous_origin_y;
gboolean horizontally;
gboolean vertically;
scaled_previous_origin_x = SCALEX (shell, previous_origin_x);
scaled_previous_origin_y = SCALEY (shell, previous_origin_y);
horizontally = (SCALEX (shell, previous_width) > shell->disp_width &&
SCALEX (shell, new_width) <= shell->disp_width);
vertically = (SCALEY (shell, previous_height) > shell->disp_height &&
SCALEY (shell, new_height) <= shell->disp_height);
gimp_display_shell_scroll_set_offset (shell,
shell->offset_x + scaled_previous_origin_x,
shell->offset_y + scaled_previous_origin_y);
gimp_display_shell_scroll_center_image (shell, horizontally, vertically);
/* The above calls might not lead to a call to
* gimp_display_shell_scroll_clamp_and_update() and
* gimp_display_shell_expose_full() in all cases because when
* scaling the old and new scroll offset might be the same.
*
* We need them to be called in all cases, so simply call them
* explicitly here at the end
*/
gimp_display_shell_scroll_clamp_and_update (shell);
gimp_display_shell_expose_full (shell);
}
}
void
gimp_display_shell_canvas_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
GimpDisplayShell *shell)
{
/* are we in destruction? */
if (! shell->display || ! gimp_display_get_shell (shell->display))
return;
if ((shell->disp_width != allocation->width) ||
(shell->disp_height != allocation->height))
{
if (shell->zoom_on_resize &&
shell->disp_width > 64 &&
shell->disp_height > 64 &&
allocation->width > 64 &&
allocation->height > 64)
{
gdouble scale = gimp_zoom_model_get_factor (shell->zoom);
gint offset_x;
gint offset_y;
/* FIXME: The code is a bit of a mess */
/* multiply the zoom_factor with the ratio of the new and
* old canvas diagonals
*/
scale *= (sqrt (SQR (allocation->width) +
SQR (allocation->height)) /
sqrt (SQR (shell->disp_width) +
SQR (shell->disp_height)));
offset_x = UNSCALEX (shell, shell->offset_x);
offset_y = UNSCALEX (shell, shell->offset_y);
gimp_zoom_model_zoom (shell->zoom, GIMP_ZOOM_TO, scale);
shell->offset_x = SCALEX (shell, offset_x);
shell->offset_y = SCALEY (shell, offset_y);
}
shell->disp_width = allocation->width;
shell->disp_height = allocation->height;
/* When we size-allocate due to resize of the top level window,
* we want some additional logic. Don't apply it on
* zoom_on_resize though.
*/
if (shell->size_allocate_from_configure_event &&
! shell->zoom_on_resize)
{
gboolean center_horizontally;
gboolean center_vertically;
gint target_offset_x;
gint target_offset_y;
gint sw;
gint sh;
gimp_display_shell_scale_get_image_size (shell, &sw, &sh);
center_horizontally = sw <= shell->disp_width;
center_vertically = sh <= shell->disp_height;
gimp_display_shell_scroll_center_image (shell,
center_horizontally,
center_vertically);
/* This is basically the best we can do before we get an
* API for storing the image offset at the start of an
* image window resize using the mouse
*/
target_offset_x = shell->offset_x;
target_offset_y = shell->offset_y;
if (! center_horizontally)
{
target_offset_x = MAX (shell->offset_x, 0);
}
if (! center_vertically)
{
target_offset_y = MAX (shell->offset_y, 0);
}
gimp_display_shell_scroll_set_offset (shell,
target_offset_x,
target_offset_y);
}
gimp_display_shell_scroll_clamp_and_update (shell);
gimp_display_shell_scaled (shell);
/* Reset */
shell->size_allocate_from_configure_event = FALSE;
}
}
