syncronize scrolling of editor with preview

Author	Karl Tauber <email>
Date	2015-07-24 10:15:31 GMT+0200
Commit	07a89ce178ab96e00471ae60704cc728db24f3d3
Parent	7781084
Delta	71 lines added, 1 line removed, 70-line increase

src/main/java/org/markdownwriterfx/util/Utils.java

		+/*
		+ * Copyright (c) 2015 Karl Tauber <karl at jformdesigner dot com>
		+ * All rights reserved.
		+ *
		+ * Redistribution and use in source and binary forms, with or without
		+ * modification, are permitted provided that the following conditions are met:
		+ *
		+ * o Redistributions of source code must retain the above copyright
		+ * notice, this list of conditions and the following disclaimer.
		+ *
		+ * o Redistributions in binary form must reproduce the above copyright
		+ * notice, this list of conditions and the following disclaimer in the
		+ * documentation and/or other materials provided with the distribution.
		+ *
		+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		+ */
		+
		+package org.markdownwriterfx.util;
		+
		+import java.util.Set;
		+import javafx.geometry.Orientation;
		+import javafx.scene.Node;
		+import javafx.scene.control.ScrollBar;
		+
		+/**
		+ * @author Karl Tauber
		+ */
		+public class Utils
		+{
		+ public static ScrollBar findVScrollBar(Node node) {
		+ Set<Node> scrollBars = node.lookupAll(".scroll-bar");
		+ for (Node scrollBar : scrollBars) {
		+ if (scrollBar instanceof ScrollBar &&
		+ ((ScrollBar)scrollBar).getOrientation() == Orientation.VERTICAL)
		+ return (ScrollBar) scrollBar;
		+ }
		+ return null;
		+ }
		+}

src/main/java/org/markdownwriterfx/preview/MarkdownPreviewPane.java

		package org.markdownwriterfx.preview;

		+import javafx.application.Platform;
		+import javafx.beans.property.DoubleProperty;
		import javafx.beans.property.ObjectProperty;
		+import javafx.beans.property.SimpleDoubleProperty;
		import javafx.beans.property.SimpleObjectProperty;
		import javafx.geometry.Side;

		webViewPreview.update(newValue);
		astPreview.update(newValue);
		+ });
		+
		+ scrollY.addListener((observable, oldValue, newValue) -> {
		+ Platform.runLater(() -> {
		+ webViewPreview.scrollY(newValue.doubleValue());
		+ astPreview.scrollY(newValue.doubleValue());
		+ });
		});
		}

		}

		- // markdownAST property
		+ // 'markdownAST' property
		private final ObjectProperty<RootNode> markdownAST = new SimpleObjectProperty<RootNode>();
		public RootNode getMarkdownAST() { return markdownAST.get(); }
		public void setMarkdownAST(RootNode astRoot) { markdownAST.set(astRoot); }
		public ObjectProperty<RootNode> markdownASTProperty() { return markdownAST; }
		+
		+ // 'scrollY' property
		+ private final DoubleProperty scrollY = new SimpleDoubleProperty();
		+ public double getScrollY() { return scrollY.get(); }
		+ public void setScrollY(double value) { scrollY.set(value); }
		+ public DoubleProperty scrollYProperty() { return scrollY; }
		}

src/main/java/org/markdownwriterfx/preview/WebViewPreview.java

		+ "</body></html>");
		}
		+
		+ void scrollY(double value) {
		+ webView.getEngine().executeScript(
		+ "window.scrollTo(0, (document.body.scrollHeight - window.innerHeight) * "+value+");");
		+ }
		}