71 lines
2.3 KiB
Java
71 lines
2.3 KiB
Java
package envoy.client.ui;
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import javax.swing.JScrollPane;
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/**
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* Project: <strong>envoy-client</strong><br>
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* File: <strong>PrimaryScrollPane.java</strong><br>
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* Created: <strong>15 Dec 2019</strong><br>
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*
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* @author Kai S. K. Engelbart
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* @author Maximilian Käfer
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*/
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public class PrimaryScrollPane extends JScrollPane {
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private static final long serialVersionUID = -4786837444056228439L;
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private int verticalScrollBarMaximum = getVerticalScrollBar().getMaximum();
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private boolean chatOpened = false;
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public PrimaryScrollPane() { setBorder(null); }
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/**
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* Styles the vertical and horizontal scroll bars.
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*
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* @param theme
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* @since Envoy v0.2-alpha
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*/
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public void applyTheme(Theme theme) {
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setForeground(theme.getBackgroundColor());
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setBackground(theme.getCellColor());
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getVerticalScrollBar().setBackground(theme.getCellColor());
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getVerticalScrollBar().setUI(new PrimaryScrollBar(theme, true));
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getHorizontalScrollBar().setBackground(theme.getCellColor());
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getHorizontalScrollBar().setUI(new PrimaryScrollBar(theme, false));
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}
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/**
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* Implements <b>autoscroll functionality</b> for the vertical scroll bar. </br>
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* </br>
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* Functionality to automatically scroll down when user views </br>
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* the bottom of the chat while there are new messages added. </br>
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* </br>
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* When chat is opened, the vertical scroll bar starts at the bottom. </br>
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* </br>
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* When rereading messages, the chat doesn't scroll down if new messages </br>
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* are added. (Besides see first point)
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*
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* @since Envoy v0.2-alpha
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*/
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public void autoscroll() {
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// Automatic scrolling to the bottom
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getVerticalScrollBar().addAdjustmentListener(e -> {
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if (verticalScrollBarMaximum == e.getAdjustable().getMaximum()) return;
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if (chatOpened) {
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e.getAdjustable().setValue(e.getAdjustable().getMaximum());
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verticalScrollBarMaximum = getVerticalScrollBar().getMaximum();
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chatOpened = false;
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return;
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}
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if (getVerticalScrollBar().getValue() + getVerticalScrollBar().getVisibleAmount() + 100 >= getVerticalScrollBar().getMaximum()) {
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e.getAdjustable().setValue(e.getAdjustable().getMaximum());
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verticalScrollBarMaximum = getVerticalScrollBar().getMaximum();
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}
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});
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}
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public void setChatOpened(boolean chatOpened) { this.chatOpened = chatOpened; }
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}
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