Add GcalOverflowBin and GcalOverflowBinLayout
This is a bin that purposefully can let its child overflow the allocation, based on the size request mode. This will be used to allow the event widget to reach smaller widths.
This commit is contained in:
Adrien Plazas
committed by
Georges Basile Stavracas Neto
Georges Basile Stavracas Neto
parent
7839041453
commit
ca0a5de0f9
@@ -0,0 +1,228 @@
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/* gcal-overflow-bin-layout.c
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*
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* Copyright (C) 2022 Purism SPC
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*
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* gnome-calendar is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* gnome-calendar is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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/**
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* GcalOverflowBinLayout:
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*
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* `GcalOverflowBinLayout` is a `GtkLayoutManager` subclass useful for create "bins" of
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* widgets.
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*
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* `GcalOverflowBinLayout` will stack each child of a widget on top of each other,
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* using the [property@Gtk.Widget:hexpand], [property@Gtk.Widget:vexpand],
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* [property@Gtk.Widget:halign], and [property@Gtk.Widget:valign] properties
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* of each child to determine where they should be positioned.
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*/
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#include "gcal-overflow-bin-layout.h"
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struct _GcalOverflowBinLayout
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{
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GtkLayoutManager parent_instance;
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GtkSizeRequestMode request_mode;
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};
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G_DEFINE_TYPE (GcalOverflowBinLayout, gcal_overflow_bin_layout, GTK_TYPE_LAYOUT_MANAGER)
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/*
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* GtkLayoutManager overrides
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*/
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static void
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gcal_overflow_bin_layout_measure (GtkLayoutManager *layout_manager,
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GtkWidget *widget,
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GtkOrientation orientation,
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gint for_size,
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gint *minimum,
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gint *natural,
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gint *minimum_baseline,
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gint *natural_baseline)
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{
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GtkSizeRequestMode request_mode;
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GtkWidget *child;
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request_mode = gtk_widget_get_request_mode (widget);
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for (child = gtk_widget_get_first_child (widget);
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child != NULL;
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child = gtk_widget_get_next_sibling (child))
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{
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gint child_min_baseline = -1;
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gint child_nat_baseline = -1;
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gint child_min = 0;
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gint child_nat = 0;
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if (!gtk_widget_should_layout (child))
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continue;
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gtk_widget_measure (child, orientation, for_size,
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&child_min, &child_nat,
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&child_min_baseline, &child_nat_baseline);
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*minimum = MAX (*minimum, child_min);
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*natural = MAX (*natural, child_nat);
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if (child_min_baseline > -1)
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*minimum_baseline = MAX (*minimum_baseline, child_min_baseline);
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if (child_nat_baseline > -1)
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*natural_baseline = MAX (*natural_baseline, child_nat_baseline);
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}
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switch (request_mode)
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{
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case GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH:
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if (orientation == GTK_ORIENTATION_VERTICAL)
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{
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*minimum = 0;
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*minimum_baseline = -1;
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}
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break;
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case GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT:
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if (orientation == GTK_ORIENTATION_HORIZONTAL)
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{
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*minimum = 0;
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*minimum_baseline = -1;
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}
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break;
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case GTK_SIZE_REQUEST_CONSTANT_SIZE:
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*minimum = 0;
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*minimum_baseline = -1;
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break;
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}
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}
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static void
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gcal_overflow_bin_layout_allocate (GtkLayoutManager *layout_manager,
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GtkWidget *widget,
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gint width,
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gint height,
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gint baseline)
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{
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GtkWidget *child;
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for (child = gtk_widget_get_first_child (widget);
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child != NULL;
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child = gtk_widget_get_next_sibling (child))
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{
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GtkSizeRequestMode child_request_mode;
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gint child_min_height = 0;
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gint child_min_width = 0;
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if (!gtk_widget_should_layout (child))
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continue;
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child_request_mode = gtk_widget_get_request_mode (child);
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switch (child_request_mode)
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{
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case GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH:
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gtk_widget_measure (child,
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GTK_ORIENTATION_HORIZONTAL,
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-1,
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&child_min_width, NULL,
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NULL, NULL);
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width = MAX (width, child_min_width);
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gtk_widget_measure (child,
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GTK_ORIENTATION_HORIZONTAL,
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width,
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&child_min_width, NULL,
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NULL, NULL);
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height = MAX (height, child_min_height);
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break;
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case GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT:
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gtk_widget_measure (child,
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GTK_ORIENTATION_HORIZONTAL,
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-1,
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&child_min_width, NULL,
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NULL, NULL);
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height = MAX (height, child_min_height);
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gtk_widget_measure (child,
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GTK_ORIENTATION_HORIZONTAL,
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height,
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&child_min_width, NULL,
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NULL, NULL);
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width = MAX (width, child_min_width);
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break;
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case GTK_SIZE_REQUEST_CONSTANT_SIZE:
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gtk_widget_measure (child,
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GTK_ORIENTATION_HORIZONTAL,
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-1,
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&child_min_width, NULL,
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NULL, NULL);
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width = MAX (width, child_min_width);
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gtk_widget_measure (child,
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GTK_ORIENTATION_HORIZONTAL,
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-1,
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&child_min_width, NULL,
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NULL, NULL);
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height = MAX (height, child_min_height);
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break;
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}
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gtk_widget_allocate (child, width, height, baseline, NULL);
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}
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}
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static GtkSizeRequestMode
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gcal_overflow_bin_layout_get_request_mode (GtkLayoutManager *layout_manager,
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GtkWidget *widget)
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{
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GcalOverflowBinLayout *self = GCAL_OVERFLOW_BIN_LAYOUT (layout_manager);
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return self->request_mode;
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}
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static void
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gcal_overflow_bin_layout_class_init (GcalOverflowBinLayoutClass *klass)
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{
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GtkLayoutManagerClass *layout_manager_class = GTK_LAYOUT_MANAGER_CLASS (klass);
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layout_manager_class->measure = gcal_overflow_bin_layout_measure;
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layout_manager_class->allocate = gcal_overflow_bin_layout_allocate;
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layout_manager_class->get_request_mode = gcal_overflow_bin_layout_get_request_mode;
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}
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static void
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gcal_overflow_bin_layout_init (GcalOverflowBinLayout *self)
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{
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self->request_mode = GTK_SIZE_REQUEST_CONSTANT_SIZE;
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}
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void
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gcal_overflow_bin_layout_set_request_mode (GcalOverflowBinLayout *self,
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GtkSizeRequestMode request_mode)
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{
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g_return_if_fail (GCAL_IS_OVERFLOW_BIN_LAYOUT (self));
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g_return_if_fail (request_mode >= GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH && request_mode <= GTK_SIZE_REQUEST_CONSTANT_SIZE);
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if (self->request_mode == request_mode)
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return;
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self->request_mode = request_mode;
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gtk_layout_manager_layout_changed (GTK_LAYOUT_MANAGER (self));
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}
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