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322 lines
9.8 KiB
322 lines
9.8 KiB
/*
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* Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.swing.text.html;
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import java.awt.*;
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import javax.swing.event.DocumentEvent;
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import javax.swing.text.*;
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import java.util.Enumeration;
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import java.lang.Integer;
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/**
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* A view implementation to display an html horizontal
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* rule.
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*
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* @author Timothy Prinzing
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* @author Sara Swanson
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*/
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class HRuleView extends View {
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/**
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* Creates a new view that represents an <hr> element.
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*
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* @param elem the element to create a view for
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*/
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public HRuleView(Element elem) {
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super(elem);
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setPropertiesFromAttributes();
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}
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/**
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* Update any cached values that come from attributes.
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*/
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protected void setPropertiesFromAttributes() {
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StyleSheet sheet = ((HTMLDocument)getDocument()).getStyleSheet();
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AttributeSet eAttr = getElement().getAttributes();
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attr = sheet.getViewAttributes(this);
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alignment = StyleConstants.ALIGN_CENTER;
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size = 0;
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noshade = null;
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widthValue = null;
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if (attr != null) {
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// getAlignment() returns ALIGN_LEFT by default, and HR should
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// use ALIGN_CENTER by default, so we check if the alignment
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// attribute is actually defined
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if (attr.getAttribute(StyleConstants.Alignment) != null) {
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alignment = StyleConstants.getAlignment(attr);
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}
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noshade = (String)eAttr.getAttribute(HTML.Attribute.NOSHADE);
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Object value = eAttr.getAttribute(HTML.Attribute.SIZE);
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if (value != null && (value instanceof String)) {
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try {
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size = Integer.parseInt((String)value);
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} catch (NumberFormatException e) {
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size = 1;
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}
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}
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value = attr.getAttribute(CSS.Attribute.WIDTH);
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if (value != null && (value instanceof CSS.LengthValue)) {
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widthValue = (CSS.LengthValue)value;
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}
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topMargin = getLength(CSS.Attribute.MARGIN_TOP, attr);
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bottomMargin = getLength(CSS.Attribute.MARGIN_BOTTOM, attr);
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leftMargin = getLength(CSS.Attribute.MARGIN_LEFT, attr);
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rightMargin = getLength(CSS.Attribute.MARGIN_RIGHT, attr);
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}
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else {
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topMargin = bottomMargin = leftMargin = rightMargin = 0;
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}
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size = Math.max(2, size);
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}
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// This will be removed and centralized at some point, need to unify this
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// and avoid private classes.
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private float getLength(CSS.Attribute key, AttributeSet a) {
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CSS.LengthValue lv = (CSS.LengthValue) a.getAttribute(key);
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float len = (lv != null) ? lv.getValue() : 0;
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return len;
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}
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// --- View methods ---------------------------------------------
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/**
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* Paints the view.
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*
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* @param g the graphics context
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* @param a the allocation region for the view
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* @see View#paint
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*/
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public void paint(Graphics g, Shape a) {
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Rectangle alloc = (a instanceof Rectangle) ? (Rectangle)a :
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a.getBounds();
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int x = 0;
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int y = alloc.y + SPACE_ABOVE + (int)topMargin;
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int width = alloc.width - (int)(leftMargin + rightMargin);
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if (widthValue != null) {
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width = (int)widthValue.getValue((float)width);
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}
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int height = alloc.height - (SPACE_ABOVE + SPACE_BELOW +
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(int)topMargin + (int)bottomMargin);
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if (size > 0)
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height = size;
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// Align the rule horizontally.
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switch (alignment) {
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case StyleConstants.ALIGN_CENTER:
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x = alloc.x + (alloc.width / 2) - (width / 2);
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break;
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case StyleConstants.ALIGN_RIGHT:
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x = alloc.x + alloc.width - width - (int)rightMargin;
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break;
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case StyleConstants.ALIGN_LEFT:
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default:
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x = alloc.x + (int)leftMargin;
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break;
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}
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// Paint either a shaded rule or a solid line.
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if (noshade != null) {
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g.setColor(Color.black);
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g.fillRect(x, y, width, height);
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}
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else {
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Color bg = getContainer().getBackground();
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Color bottom, top;
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if (bg == null || bg.equals(Color.white)) {
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top = Color.darkGray;
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bottom = Color.lightGray;
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}
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else {
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top = Color.darkGray;
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bottom = Color.white;
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}
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g.setColor(bottom);
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g.drawLine(x + width - 1, y, x + width - 1, y + height - 1);
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g.drawLine(x, y + height - 1, x + width - 1, y + height - 1);
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g.setColor(top);
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g.drawLine(x, y, x + width - 1, y);
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g.drawLine(x, y, x, y + height - 1);
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}
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}
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/**
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* Calculates the desired shape of the rule... this is
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* basically the preferred size of the border.
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*
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* @param axis may be either X_AXIS or Y_AXIS
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* @return the desired span
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* @see View#getPreferredSpan
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*/
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public float getPreferredSpan(int axis) {
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switch (axis) {
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case View.X_AXIS:
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return 1;
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case View.Y_AXIS:
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if (size > 0) {
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return size + SPACE_ABOVE + SPACE_BELOW + topMargin +
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bottomMargin;
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} else {
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if (noshade != null) {
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return 2 + SPACE_ABOVE + SPACE_BELOW + topMargin +
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bottomMargin;
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} else {
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return SPACE_ABOVE + SPACE_BELOW + topMargin +bottomMargin;
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}
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}
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default:
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throw new IllegalArgumentException("Invalid axis: " + axis);
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}
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}
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/**
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* Gets the resize weight for the axis.
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* The rule is: rigid vertically and flexible horizontally.
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*
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* @param axis may be either X_AXIS or Y_AXIS
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* @return the weight
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*/
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public int getResizeWeight(int axis) {
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if (axis == View.X_AXIS) {
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return 1;
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} else if (axis == View.Y_AXIS) {
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return 0;
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} else {
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return 0;
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}
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}
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/**
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* Determines how attractive a break opportunity in
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* this view is. This is implemented to request a forced break.
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*
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* @param axis may be either View.X_AXIS or View.Y_AXIS
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* @param pos the potential location of the start of the
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* broken view (greater than or equal to zero).
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* This may be useful for calculating tab
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* positions.
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* @param len specifies the relative length from <em>pos</em>
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* where a potential break is desired. The value must be greater
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* than or equal to zero.
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* @return the weight, which should be a value between
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* ForcedBreakWeight and BadBreakWeight.
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*/
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public int getBreakWeight(int axis, float pos, float len) {
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if (axis == X_AXIS) {
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return ForcedBreakWeight;
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}
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return BadBreakWeight;
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}
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public View breakView(int axis, int offset, float pos, float len) {
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return null;
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}
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/**
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* Provides a mapping from the document model coordinate space
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* to the coordinate space of the view mapped to it.
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*
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* @param pos the position to convert
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* @param a the allocated region to render into
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* @return the bounding box of the given position
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* @exception BadLocationException if the given position does not
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* represent a valid location in the associated document
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* @see View#modelToView
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*/
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public Shape modelToView(int pos, Shape a, Position.Bias b) throws BadLocationException {
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int p0 = getStartOffset();
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int p1 = getEndOffset();
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if ((pos >= p0) && (pos <= p1)) {
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Rectangle r = a.getBounds();
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if (pos == p1) {
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r.x += r.width;
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}
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r.width = 0;
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return r;
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}
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return null;
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}
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/**
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* Provides a mapping from the view coordinate space to the logical
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* coordinate space of the model.
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*
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* @param x the X coordinate
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* @param y the Y coordinate
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* @param a the allocated region to render into
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* @return the location within the model that best represents the
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* given point of view
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* @see View#viewToModel
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*/
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public int viewToModel(float x, float y, Shape a, Position.Bias[] bias) {
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Rectangle alloc = (Rectangle) a;
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if (x < alloc.x + (alloc.width / 2)) {
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bias[0] = Position.Bias.Forward;
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return getStartOffset();
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}
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bias[0] = Position.Bias.Backward;
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return getEndOffset();
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}
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/**
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* Fetches the attributes to use when rendering. This is
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* implemented to multiplex the attributes specified in the
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* model with a StyleSheet.
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*/
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public AttributeSet getAttributes() {
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return attr;
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}
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public void changedUpdate(DocumentEvent changes, Shape a, ViewFactory f) {
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super.changedUpdate(changes, a, f);
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int pos = changes.getOffset();
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if (pos <= getStartOffset() && (pos + changes.getLength()) >=
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getEndOffset()) {
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setPropertiesFromAttributes();
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}
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}
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// --- variables ------------------------------------------------
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private float topMargin;
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private float bottomMargin;
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private float leftMargin;
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private float rightMargin;
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private int alignment = StyleConstants.ALIGN_CENTER;
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private String noshade = null;
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private int size = 0;
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private CSS.LengthValue widthValue;
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private static final int SPACE_ABOVE = 3;
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private static final int SPACE_BELOW = 3;
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/** View Attributes. */
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private AttributeSet attr;
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}
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