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PIKApp
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PIKApp/app/display/pikadisplayshell-callbacks.c

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/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* 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 <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libpikamath/pikamath.h"
#include "libpikawidgets/pikawidgets.h"
#include "display-types.h"
#include "core/pika.h"
#include "core/pikaimage.h"
#include "core/pikaimage-quick-mask.h"
#include "menus/menus.h"
#include "widgets/pikacairo-mascot.h"
#include "widgets/pikamenufactory.h"
#include "widgets/pikauimanager.h"
#include "pikacanvasitem.h"
#include "pikadisplay.h"
#include "pikadisplayshell.h"
#include "pikadisplayshell-appearance.h"
#include "pikadisplayshell-callbacks.h"
#include "pikadisplayshell-draw.h"
#include "pikadisplayshell-render.h"
#include "pikadisplayshell-scale.h"
#include "pikadisplayshell-scroll.h"
#include "pikadisplayshell-scrollbars.h"
#include "pikadisplayshell-selection.h"
#include "pikadisplayshell-title.h"
#include "pikadisplayshell-transform.h"
#include "pikaimagewindow.h"
#include "pikanavigationeditor.h"
#include "git-version.h"
#include "pika-intl.h"
/* local function prototypes */
static void pika_display_shell_vadjustment_changed (GtkAdjustment *adjustment,
PikaDisplayShell *shell);
static void pika_display_shell_hadjustment_changed (GtkAdjustment *adjustment,
PikaDisplayShell *shell);
static gboolean pika_display_shell_vscrollbar_change_value (GtkRange *range,
GtkScrollType scroll,
gdouble value,
PikaDisplayShell *shell);
static gboolean pika_display_shell_hscrollbar_change_value (GtkRange *range,
GtkScrollType scroll,
gdouble value,
PikaDisplayShell *shell);
static void pika_display_shell_canvas_draw_image (PikaDisplayShell *shell,
cairo_t *cr);
static void pika_display_shell_canvas_draw_drop_zone (PikaDisplayShell *shell,
cairo_t *cr);
/* public functions */
void
pika_display_shell_canvas_realize (GtkWidget *canvas,
PikaDisplayShell *shell)
{
PikaCanvasPaddingMode padding_mode;
PikaRGB padding_color;
GtkAllocation allocation;
gtk_widget_grab_focus (canvas);
pika_display_shell_get_padding (shell, &padding_mode, &padding_color);
pika_display_shell_set_padding (shell, padding_mode, &padding_color);
gtk_widget_get_allocation (canvas, &allocation);
pika_display_shell_title_update (shell);
shell->disp_width = allocation.width;
shell->disp_height = allocation.height;
pika_display_shell_render_set_scale (
shell,
gdk_window_get_scale_factor (
gtk_widget_get_window (gtk_widget_get_toplevel (canvas))));
/* set up the scrollbar observers */
g_signal_connect (shell->hsbdata, "value-changed",
G_CALLBACK (pika_display_shell_hadjustment_changed),
shell);
g_signal_connect (shell->vsbdata, "value-changed",
G_CALLBACK (pika_display_shell_vadjustment_changed),
shell);
g_signal_connect (shell->hsb, "change-value",
G_CALLBACK (pika_display_shell_hscrollbar_change_value),
shell);
g_signal_connect (shell->vsb, "change-value",
G_CALLBACK (pika_display_shell_vscrollbar_change_value),
shell);
/* allow shrinking */
gtk_widget_set_size_request (GTK_WIDGET (shell), 0, 0);
}
typedef struct
{
PikaDisplayShell *shell;
gint prev_width;
gint prev_height;
} TickClosure;
static gboolean
pika_display_shell_canvas_tick (GtkWidget *widget,
GdkFrameClock *frame_clock,
TickClosure *tick)
{
PikaDisplayShell *shell = tick->shell;
GtkAllocation allocation;
gtk_widget_get_allocation (widget, &allocation);
if ((tick->prev_width != allocation.width) ||
(tick->prev_height != allocation.height))
{
if (shell->zoom_on_resize &&
tick->prev_width > 64 &&
tick->prev_height > 64 &&
allocation.width > 64 &&
allocation.height > 64)
{
gdouble scale = pika_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 (tick->prev_width) +
SQR (tick->prev_height)));
offset_x = UNSCALEX (shell, shell->offset_x);
offset_y = UNSCALEX (shell, shell->offset_y);
pika_zoom_model_zoom (shell->zoom, PIKA_ZOOM_TO, scale);
shell->offset_x = SCALEX (shell, offset_x);
shell->offset_y = SCALEY (shell, offset_y);
}
/* 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;
pika_display_shell_scale_get_image_size (shell, &sw, &sh);
center_horizontally = sw <= shell->disp_width;
center_vertically = sh <= shell->disp_height;
if (! pika_display_shell_get_infinite_canvas (shell))
{
pika_display_shell_scroll_center_image (shell,
center_horizontally,
center_vertically);
}
else
{
pika_display_shell_scroll_center_content (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);
}
pika_display_shell_scroll_set_offset (shell,
target_offset_x,
target_offset_y);
}
pika_display_shell_scroll_clamp_and_update (shell);
pika_display_shell_scaled (shell);
shell->size_allocate_from_configure_event = FALSE;
}
if (shell->size_allocate_center_image)
{
pika_display_shell_scroll_center_image (shell, TRUE, TRUE);
shell->size_allocate_center_image = FALSE;
}
/* undo size request from pika_display_shell_constructed() */
gtk_widget_set_size_request (widget, -1, -1);
return G_SOURCE_REMOVE;
}
void
pika_display_shell_canvas_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
PikaDisplayShell *shell)
{
TickClosure *tick;
/* are we in destruction? */
if (! shell->display || ! pika_display_get_shell (shell->display))
return;
tick = g_new0 (TickClosure, 1);
tick->shell = shell;
tick->prev_width = shell->disp_width;
tick->prev_height = shell->disp_height;
if (shell->disp_width != allocation->width ||
shell->disp_height != allocation->height)
{
g_clear_pointer (&shell->render_cache, cairo_surface_destroy);
pika_display_shell_render_invalidate_full (shell);
shell->disp_width = allocation->width;
shell->disp_height = allocation->height;
}
gtk_widget_add_tick_callback (widget,
(GtkTickCallback) pika_display_shell_canvas_tick,
tick, (GDestroyNotify) g_free);
}
gboolean
pika_display_shell_canvas_draw (GtkWidget *widget,
cairo_t *cr,
PikaDisplayShell *shell)
{
/* are we in destruction? */
if (! shell->display || ! pika_display_get_shell (shell->display))
return TRUE;
/* we will scroll around in the next tick anyway, so we just can as
* well skip the drawing of this frame and wait for the next
*/
if (shell->size_allocate_center_image)
return TRUE;
/* ignore events on overlays */
if (gtk_cairo_should_draw_window (cr, gtk_widget_get_window (widget)))
{
PikaImage *image = pika_display_get_image (shell->display);
/* If we are currently converting the image, it might be in inconsistent
* state and should not be redrawn.
*/
if (image != NULL && ! pika_image_get_converting (image))
{
pika_display_shell_canvas_draw_image (shell, cr);
}
else if (image == NULL)
{
pika_display_shell_canvas_draw_drop_zone (shell, cr);
}
}
return FALSE;
}
gboolean
pika_display_shell_origin_button_press (GtkWidget *widget,
GdkEventButton *event,
PikaDisplayShell *shell)
{
if (! shell->display->pika->busy)
{
if (event->type == GDK_BUTTON_PRESS && event->button == 1)
{
gboolean unused;
g_signal_emit_by_name (shell, "popup-menu", &unused);
}
}
/* Return TRUE to stop signal emission so the button doesn't grab the
* pointer away from us.
*/
return TRUE;
}
gboolean
pika_display_shell_quick_mask_button_press (GtkWidget *widget,
GdkEventButton *bevent,
PikaDisplayShell *shell)
{
if (! pika_display_get_image (shell->display))
return TRUE;
if (gdk_event_triggers_context_menu ((GdkEvent *) bevent))
{
PikaImageWindow *window = pika_display_shell_get_window (shell);
if (window)
{
Pika *pika;
PikaUIManager *manager;
pika = shell->display->pika;
manager = pika_menu_factory_get_manager (menus_get_global_menu_factory (pika), "<QuickMask>", pika);
pika_ui_manager_ui_popup_at_widget (manager,
"/quick-mask-popup",
NULL, NULL,
widget,
GDK_GRAVITY_EAST,
GDK_GRAVITY_SOUTH_WEST,
(GdkEvent *) bevent,
NULL, NULL);
}
return TRUE;
}
return FALSE;
}
void
pika_display_shell_quick_mask_toggled (GtkWidget *widget,
PikaDisplayShell *shell)
{
PikaImage *image = pika_display_get_image (shell->display);
gboolean active = gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (widget));
if (active != pika_image_get_quick_mask_state (image))
{
PikaImageWindow *window = pika_display_shell_get_window (shell);
if (window)
{
PikaUIManager *manager = menus_get_image_manager_singleton (shell->display->pika);
pika_ui_manager_toggle_action (manager,
"quick-mask", "quick-mask-toggle",
active);
}
}
}
gboolean
pika_display_shell_navigation_button_press (GtkWidget *widget,
GdkEventButton *bevent,
PikaDisplayShell *shell)
{
if (! pika_display_get_image (shell->display))
return TRUE;
if (bevent->type == GDK_BUTTON_PRESS && bevent->button == 1)
{
pika_navigation_editor_popup (shell, widget,
(GdkEvent *) bevent,
bevent->x, bevent->y);
}
return TRUE;
}
/* private functions */
static void
pika_display_shell_vadjustment_changed (GtkAdjustment *adjustment,
PikaDisplayShell *shell)
{
/* If we are panning with mouse, scrollbars are to be ignored or
* they will cause jitter in motion
*/
if (shell->mod_action == PIKA_MODIFIER_ACTION_NONE)
pika_display_shell_scroll (shell,
0,
gtk_adjustment_get_value (adjustment) -
shell->offset_y);
}
static void
pika_display_shell_hadjustment_changed (GtkAdjustment *adjustment,
PikaDisplayShell *shell)
{
/* If we are panning with mouse, scrollbars are to be ignored or
* they will cause jitter in motion
*/
if (shell->mod_action == PIKA_MODIFIER_ACTION_NONE)
pika_display_shell_scroll (shell,
gtk_adjustment_get_value (adjustment) -
shell->offset_x,
0);
}
static gboolean
pika_display_shell_hscrollbar_change_value (GtkRange *range,
GtkScrollType scroll,
gdouble value,
PikaDisplayShell *shell)
{
if (! shell->display)
return TRUE;
if ((scroll == GTK_SCROLL_JUMP) ||
(scroll == GTK_SCROLL_PAGE_BACKWARD) ||
(scroll == GTK_SCROLL_PAGE_FORWARD))
return FALSE;
g_object_freeze_notify (G_OBJECT (shell->hsbdata));
pika_display_shell_scrollbars_setup_horizontal (shell, value);
g_object_thaw_notify (G_OBJECT (shell->hsbdata)); /* emits "changed" */
return FALSE;
}
static gboolean
pika_display_shell_vscrollbar_change_value (GtkRange *range,
GtkScrollType scroll,
gdouble value,
PikaDisplayShell *shell)
{
if (! shell->display)
return TRUE;
if ((scroll == GTK_SCROLL_JUMP) ||
(scroll == GTK_SCROLL_PAGE_BACKWARD) ||
(scroll == GTK_SCROLL_PAGE_FORWARD))
return FALSE;
g_object_freeze_notify (G_OBJECT (shell->vsbdata));
pika_display_shell_scrollbars_setup_vertical (shell, value);
g_object_thaw_notify (G_OBJECT (shell->vsbdata)); /* emits "changed" */
return FALSE;
}
static void
pika_display_shell_canvas_draw_image (PikaDisplayShell *shell,
cairo_t *cr)
{
cairo_rectangle_list_t *clip_rectangles;
GeglRectangle image_rect;
GeglRectangle rotated_image_rect;
GeglRectangle canvas_rect;
cairo_matrix_t matrix;
gdouble x1, y1;
gdouble x2, y2;
pika_display_shell_scale_get_image_unrotated_bounding_box (
shell,
&image_rect.x,
&image_rect.y,
&image_rect.width,
&image_rect.height);
pika_display_shell_scale_get_image_unrotated_bounds (
shell,
&canvas_rect.x,
&canvas_rect.y,
&canvas_rect.width,
&canvas_rect.height);
/* first, draw the background
*/
pika_display_shell_draw_background (shell, cr);
/* then, draw the exposed part of the region that is inside the
* image
*/
cairo_save (cr);
clip_rectangles = cairo_copy_clip_rectangle_list (cr);
cairo_get_matrix (cr, &matrix);
if (shell->rotate_transform)
cairo_transform (cr, shell->rotate_transform);
if (shell->show_all)
{
cairo_save (cr);
if (pika_display_shell_get_padding_in_show_all (shell))
{
cairo_rectangle (cr,
canvas_rect.x,
canvas_rect.y,
canvas_rect.width,
canvas_rect.height);
cairo_clip (cr);
}
pika_display_shell_draw_checkerboard (shell, cr);
cairo_restore (cr);
}
cairo_rectangle (cr,
image_rect.x,
image_rect.y,
image_rect.width,
image_rect.height);
cairo_clip (cr);
pika_display_shell_rotate_bounds (shell,
image_rect.x,
image_rect.y,
image_rect.x + image_rect.width,
image_rect.y + image_rect.height,
&x1, &y1, &x2, &y2);
rotated_image_rect.x = floor (x1);
rotated_image_rect.y = floor (y1);
rotated_image_rect.width = ceil (x2) - rotated_image_rect.x;
rotated_image_rect.height = ceil (y2) - rotated_image_rect.y;
if (gdk_cairo_get_clip_rectangle (cr, NULL))
{
gint i;
if (! shell->show_all)
{
cairo_save (cr);
pika_display_shell_draw_checkerboard (shell, cr);
cairo_restore (cr);
}
if (shell->show_image)
{
cairo_set_matrix (cr, &matrix);
for (i = 0; i < clip_rectangles->num_rectangles; i++)
{
cairo_rectangle_t clip_rect = clip_rectangles->rectangles[i];
GeglRectangle rect;
rect.x = floor (clip_rect.x);
rect.y = floor (clip_rect.y);
rect.width = ceil (clip_rect.x + clip_rect.width) - rect.x;
rect.height = ceil (clip_rect.y + clip_rect.height) - rect.y;
if (gegl_rectangle_intersect (&rect, &rect, &rotated_image_rect))
{
pika_display_shell_draw_image (shell, cr,
rect.x, rect.y,
rect.width, rect.height);
}
}
}
}
cairo_rectangle_list_destroy (clip_rectangles);
cairo_restore (cr);
/* finally, draw all the remaining image window stuff on top
*/
/* draw canvas items */
cairo_save (cr);
if (shell->rotate_transform)
cairo_transform (cr, shell->rotate_transform);
pika_canvas_item_draw (shell->canvas_item, cr);
cairo_restore (cr);
pika_canvas_item_draw (shell->unrotated_item, cr);
/* restart (and recalculate) the selection boundaries */
pika_display_shell_selection_draw (shell, cr);
pika_display_shell_selection_restart (shell);
}
static void
pika_display_shell_canvas_draw_drop_zone (PikaDisplayShell *shell,
cairo_t *cr)
{
cairo_save (cr);
pika_display_shell_draw_background (shell, cr);
pika_cairo_draw_drop_mascot (shell->canvas, cr, shell->blink);
cairo_restore (cr);
#ifdef PIKA_UNSTABLE
{
GtkWidget *widget = GTK_WIDGET (shell);
GtkStyleContext *context = gtk_widget_get_style_context (widget);
GtkStateFlags state = gtk_widget_get_state_flags (widget);
PangoLayout *layout;
gchar *msg;
GtkAllocation allocation;
gint width;
gint height;
gdouble scale;
GdkRGBA color;
layout = gtk_widget_create_pango_layout (shell->canvas, NULL);
msg = g_strdup_printf (_("<big>Unstable Development Version</big>\n\n"
"<small>commit <tt>%s</tt></small>\n\n"
"<small>Please test bugs against "
"latest git master branch\n"
"before reporting them.</small>"),
PIKA_GIT_VERSION_ABBREV);
pango_layout_set_markup (layout, msg, -1);
g_free (msg);
pango_layout_set_alignment (layout, PANGO_ALIGN_CENTER);
pango_layout_get_pixel_size (layout, &width, &height);
gtk_widget_get_allocation (shell->canvas, &allocation);
scale = MIN (((gdouble) allocation.width / 2.0) / (gdouble) width,
((gdouble) allocation.height / 2.0) / (gdouble) height);
gtk_style_context_get_color (context, state, &color);
gdk_cairo_set_source_rgba (cr, &color);
cairo_move_to (cr,
(allocation.width - (width * scale)) / 2,
(allocation.height - (height * scale)) / 2);
cairo_scale (cr, scale, scale);
pango_cairo_show_layout (cr, layout);
g_object_unref (layout);
}
#endif /* PIKA_UNSTABLE */
}
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