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Diffstat (limited to 'app/display/gimpdisplayshell-scrollbars.c')
| -rw-r--r-- | app/display/gimpdisplayshell-scrollbars.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/app/display/gimpdisplayshell-scrollbars.c b/app/display/gimpdisplayshell-scrollbars.c new file mode 100644 index 0000000..3696e01 --- /dev/null +++ b/app/display/gimpdisplayshell-scrollbars.c @@ -0,0 +1,244 @@ +/* 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 <https://www.gnu.org/licenses/>. + */ + +#include "config.h" + +#include <math.h> + +#include <gegl.h> +#include <gtk/gtk.h> + +#include "display-types.h" + +#include "core/gimpimage.h" + +#include "gimpdisplay.h" +#include "gimpdisplayshell.h" +#include "gimpdisplayshell-scale.h" +#include "gimpdisplayshell-scrollbars.h" + + +#define MINIMUM_STEP_AMOUNT 1.0 + + +/** + * gimp_display_shell_scrollbars_update: + * @shell: + * + **/ +void +gimp_display_shell_scrollbars_update (GimpDisplayShell *shell) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + + if (! shell->display) + return; + + /* Horizontal scrollbar */ + + g_object_freeze_notify (G_OBJECT (shell->hsbdata)); + + /* Update upper and lower value before we set the new value */ + gimp_display_shell_scrollbars_setup_horizontal (shell, shell->offset_x); + + g_object_set (shell->hsbdata, + "value", (gdouble) shell->offset_x, + "page-size", (gdouble) shell->disp_width, + "page-increment", (gdouble) shell->disp_width / 2, + NULL); + + g_object_thaw_notify (G_OBJECT (shell->hsbdata)); /* emits "changed" */ + + + /* Vertcal scrollbar */ + + g_object_freeze_notify (G_OBJECT (shell->vsbdata)); + + /* Update upper and lower value before we set the new value */ + gimp_display_shell_scrollbars_setup_vertical (shell, shell->offset_y); + + g_object_set (shell->vsbdata, + "value", (gdouble) shell->offset_y, + "page-size", (gdouble) shell->disp_height, + "page-increment", (gdouble) shell->disp_height / 2, + NULL); + + g_object_thaw_notify (G_OBJECT (shell->vsbdata)); /* emits "changed" */ +} + +/** + * gimp_display_shell_scrollbars_setup_horizontal: + * @shell: + * @value: + * + * Setup the limits of the horizontal scrollbar + **/ +void +gimp_display_shell_scrollbars_setup_horizontal (GimpDisplayShell *shell, + gdouble value) +{ + gint bounds_x; + gint bounds_width; + gint bounding_box_x; + gint bounding_box_width; + gint x1; + gint x2; + gdouble lower; + gdouble upper; + gdouble scale_x; + + 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_bounds (shell, + &bounds_x, NULL, + &bounds_width, NULL); + + if (! gimp_display_shell_get_infinite_canvas (shell)) + { + bounding_box_x = bounds_x; + bounding_box_width = bounds_width; + } + else + { + gimp_display_shell_scale_get_image_bounding_box ( + shell, + &bounding_box_x, NULL, + &bounding_box_width, NULL); + } + + x1 = bounding_box_x; + x2 = bounding_box_x + bounding_box_width; + + x1 = MIN (x1, bounds_x + bounds_width / 2 - shell->disp_width / 2); + x2 = MAX (x2, bounds_x + bounds_width / 2 + (shell->disp_width + 1) / 2); + + lower = MIN (value, x1); + upper = MAX (value + shell->disp_width, x2); + + gimp_display_shell_get_rotated_scale (shell, &scale_x, NULL); + + g_object_set (shell->hsbdata, + "lower", lower, + "upper", upper, + "step-increment", (gdouble) MAX (scale_x, MINIMUM_STEP_AMOUNT), + NULL); +} + +/** + * gimp_display_shell_scrollbars_setup_vertical: + * @shell: + * @value: + * + * Setup the limits of the vertical scrollbar + **/ +void +gimp_display_shell_scrollbars_setup_vertical (GimpDisplayShell *shell, + gdouble value) +{ + gint bounds_y; + gint bounds_height; + gint bounding_box_y; + gint bounding_box_height; + gint y1; + gint y2; + gdouble lower; + gdouble upper; + gdouble scale_y; + + 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_bounds (shell, + NULL, &bounds_y, + NULL, &bounds_height); + + if (! gimp_display_shell_get_infinite_canvas (shell)) + { + bounding_box_y = bounds_y; + bounding_box_height = bounds_height; + } + else + { + gimp_display_shell_scale_get_image_bounding_box ( + shell, + NULL, &bounding_box_y, + NULL, &bounding_box_height); + } + + y1 = bounding_box_y; + y2 = bounding_box_y + bounding_box_height; + + y1 = MIN (y1, bounds_y + bounds_height / 2 - shell->disp_height / 2); + y2 = MAX (y2, bounds_y + bounds_height / 2 + (shell->disp_height + 1) / 2); + + lower = MIN (value, y1); + upper = MAX (value + shell->disp_height, y2); + + gimp_display_shell_get_rotated_scale (shell, NULL, &scale_y); + + g_object_set (shell->vsbdata, + "lower", lower, + "upper", upper, + "step-increment", (gdouble) MAX (scale_y, MINIMUM_STEP_AMOUNT), + NULL); +} + +/** + * gimp_display_shell_scrollbars_update_steppers: + * @shell: + * @min_offset_x: + * @max_offset_x: + * @min_offset_y: + * @max_offset_y: + * + * Sets the scrollbars' stepper sensitivity which is set differently + * from its adjustment limits because we support overscrolling. + **/ +void +gimp_display_shell_scrollbars_update_steppers (GimpDisplayShell *shell, + gint min_offset_x, + gint max_offset_x, + gint min_offset_y, + gint max_offset_y) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + + 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); +} |