mirror of
https://github.com/DSheirer/sdrtrunk.git
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85 lines
3.1 KiB
Java
85 lines
3.1 KiB
Java
/*
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* *****************************************************************************
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* Copyright (C) 2014-2026 Dennis Sheirer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the 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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* 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
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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* ****************************************************************************
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*/
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package io.github.dsheirer.gui.control;
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import javafx.collections.ListChangeListener;
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import javafx.scene.control.Label;
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import javafx.scene.control.ToggleButton;
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import org.controlsfx.control.SegmentedButton;
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/**
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* Screen reader (accessibility) utilities for JavaFX controls.
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*/
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public final class AccessibilityUtil
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{
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private AccessibilityUtil()
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{
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//Not instantiable
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}
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/**
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* Provides an accessible name for each toggle button in a segmented button group, combining the group label with
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* the button text (e.g. "Channel Bandwidth: 12.5 kHz").
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*
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* A segmented button is a container, so a label can't identify it via Label.setLabelFor() in a way that screen
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* readers announce: each toggle button receives focus individually and would otherwise be announced by its own text
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* only, without the context of the group. Buttons added to the group later are also named.
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*
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* @param groupLabel that visually identifies the segmented button group
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* @param segmentedButton containing the toggle buttons
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*/
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public static void labelGroup(Label groupLabel, SegmentedButton segmentedButton)
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{
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String groupName = groupLabel.getText() == null ? "" : groupLabel.getText().trim();
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//Remove a trailing colon so that the name doesn't announce "colon colon"
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if(groupName.endsWith(":"))
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{
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groupName = groupName.substring(0, groupName.length() - 1).trim();
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}
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final String name = groupName;
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for(ToggleButton button: segmentedButton.getButtons())
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{
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setGroupName(name, button);
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}
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segmentedButton.getButtons().addListener((ListChangeListener<ToggleButton>)change -> {
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while(change.next())
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{
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for(ToggleButton added: change.getAddedSubList())
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{
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setGroupName(name, added);
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}
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}
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});
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}
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/**
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* Sets the accessible text for the button as the group name and button text.
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*/
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private static void setGroupName(String groupName, ToggleButton button)
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{
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String text = button.getText() == null ? "" : button.getText();
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button.setAccessibleText(groupName.isEmpty() ? text : groupName + ": " + text);
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}
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}
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