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JDK 1.1 Source Code Directory
JDK 1.1 source code directory contains Java source code for JDK 1.1 core classes: "C:\fyicenter\jdk-1.1.8\src".
Here is the list of Java classes of the JDK 1.1 source code:
✍: FYIcenter
⏎ java/awt/GridBagLayout.java
/* * @(#)GridBagLayout.java 1.25 01/12/10 * * Copyright 2002 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.awt; import java.util.Hashtable; import java.util.Vector; class GridBagLayoutInfo implements java.io.Serializable { int width, height; /* number of cells horizontally, vertically */ int startx, starty; /* starting point for layout */ int minWidth[]; /* largest minWidth in each column */ int minHeight[]; /* largest minHeight in each row */ double weightX[]; /* largest weight in each column */ double weightY[]; /* largest weight in each row */ GridBagLayoutInfo () { minWidth = new int[GridBagLayout.MAXGRIDSIZE]; minHeight = new int[GridBagLayout.MAXGRIDSIZE]; weightX = new double[GridBagLayout.MAXGRIDSIZE]; weightY = new double[GridBagLayout.MAXGRIDSIZE]; } } /** * The <code>GridBagLayout</code> class is a flexible layout * manager that aligns components vertically and horizontally, * without requiring that the components be of the same size. * Each <code>GridBagLayout</code> object maintains a dynamic * rectangular grid of cells, with each component occupying * one or more cells, called its <em>display area</em>. * <p> * Each component managed by a grid bag layout is associated * with an instance of * <a href="java.awt.GridBagConstraints.html"><code>GridBagConstraints</code></a> * that specifies how the component is laid out within its display area. * <p> * How a <code>GridBagLayout</code> object places a set of components * depends on the <code>GridBagConstraints</code> object associated * with each component, and on the minimum size * and the preferred size of the components' containers. * <p> * To use a grid bag layout effectively, you must customize one or more * of the <code>GridBagConstraints</code> objects that are associated * with its components. You customize a <code>GridBagConstraints</code> * object by setting one or more of its instance variables: * <p> * <dl> * <dt><a href="java.awt.GridBagConstraints.html#gridx"><code>gridx</code></a>, * <a href="java.awt.GridBagConstraints.html#gridy"><code>gridy</code></a> * <dd>Specifies the cell at the upper left of the component's display area, * where the upper-left-most cell has address * <code>gridx = 0</code>, * <code>gridy = 0</code>. * Use <code>GridBagConstraints.RELATIVE</code> (the default value) * to specify that the component be just placed * just to the right of (for <code>gridx</code>) * or just below (for <code>gridy</code>) * the component that was added to the container * just before this component was added. * <dt><a href="java.awt.GridBagConstraints.html#gridwidth"><code>gridwidth</code></a>, * <a href="java.awt.GridBagConstraints.html#gridheight"><code>gridheight</code></a> * <dd>Specifies the number of cells in a row (for <code>gridwidth</code>) * or column (for <code>gridheight</code>) * in the component's display area. * The default value is 1. * Use <code>GridBagConstraints.REMAINDER</code> to specify * that the component be the last one in its row (for <code>gridwidth</code>) * or column (for <code>gridheight</code>). * Use <code>GridBagConstraints.RELATIVE</code> to specify * that the component be the next to last one * in its row (for <code>gridwidth</code>) * or column (for <code>gridheight</code>). * <dt><a href="java.awt.GridBagConstraints.html#fill"><code>fill</code></a> * <dd>Used when the component's display area * is larger than the component's requested size * to determine whether (and how) to resize the component. * Possible values are * <code>GridBagConstraints.NONE</code> (the default), * <code>GridBagConstraints.HORIZONTAL</code> * (make the component wide enough to fill its display area * horizontally, but don't change its height), * <code>GridBagConstraints.VERTICAL</code> * (make the component tall enough to fill its display area * vertically, but don't change its width), and * <code>GridBagConstraints.BOTH</code> * (make the component fill its display area entirely). * <dt><a href="java.awt.GridBagConstraints.html#ipadx"><code>ipadx</code></a>, * <a href="java.awt.GridBagConstraints.html#ipady"><code>ipady</code></a> * <dd>Specifies the component's internal padding within the layout, * how much to add to the minimum size of the component. * The width of the component will be at least its minimum width * plus <code>(ipadx * 2)</code> pixels (since the padding * applies to both sides of the component). Similarly, the height of * the component will be at least the minimum height plus * <code>(ipady * 2)</code> pixels. * <dt><a href="java.awt.GridBagConstraints.html#insets"><code>insets</code></a> * <dd>Specifies the component's external padding, the minimum * amount of space between the component and the edges of its display area. * <dt><a href="java.awt.GridBagConstraints.html#anchor"><code>anchor</code></a> * <dd>Used when the component is smaller than its display area * to determine where (within the display area) to place the component. * Valid values are * <code>GridBagConstraints.CENTER</code> (the default), * <code>GridBagConstraints.NORTH</code>, * <code>GridBagConstraints.NORTHEAST</code>, * <code>GridBagConstraints.EAST</code>, * <code>GridBagConstraints.SOUTHEAST</code>, * <code>GridBagConstraints.SOUTH</code>, * <code>GridBagConstraints.SOUTHWEST</code>, * <code>GridBagConstraints.WEST</code>, and * <code>GridBagConstraints.NORTHWEST</code>. * <dt><a href="java.awt.GridBagConstraints.html#weightx"><code>weightx</code></a>, * <a href="java.awt.GridBagConstraints.html#weighty"><code>weighty</code></a> * <dd>Used to determine how to distribute space, which is * important for specifying resizing behavior. * Unless you specify a weight for at least one component * in a row (<code>weightx</code>) and column (<code>weighty</code>), * all the components clump together in the center of their container. * This is because when the weight is zero (the default), * the <code>GridBagLayout</code> object puts any extra space * between its grid of cells and the edges of the container. * </dl> * <p> * The following figure shows ten components (all buttons) * managed by a grid bag layout: * <p> * <img src="images-awt/GridBagLayout-1.gif" * ALIGN=center HSPACE=10 VSPACE=7> * <p> * Each of the ten components has the <code>fill</code> field * of its associated <code>GridBagConstraints</code> object * set to <code>GridBagConstraints.BOTH</code>. * In addition, the components have the following non-default constraints: * <p> * <ul> * <li>Button1, Button2, Button3: <code>weightx = 1.0</code> * <li>Button4: <code>weightx = 1.0</code>, * <code>gridwidth = GridBagConstraints.REMAINDER</code> * <li>Button5: <code>gridwidth = GridBagConstraints.REMAINDER</code> * <li>Button6: <code>gridwidth = GridBagConstraints.RELATIVE</code> * <li>Button7: <code>gridwidth = GridBagConstraints.REMAINDER</code> * <li>Button8: <code>gridheight = 2</code>, * <code>weighty = 1.0</code> * <li>Button9, Button 10: * <code>gridwidth = GridBagConstraints.REMAINDER</code> * </ul> * <p> * Here is the code that implements the example shown above: * <p> * <hr><blockquote><pre> * import java.awt.*; * import java.util.*; * import java.applet.Applet; * * public class GridBagEx1 extends Applet { * * protected void makebutton(String name, * GridBagLayout gridbag, * GridBagConstraints c) { * Button button = new Button(name); * gridbag.setConstraints(button, c); * add(button); * } * * public void init() { * GridBagLayout gridbag = new GridBagLayout(); * GridBagConstraints c = new GridBagConstraints(); * * setFont(new Font("Helvetica", Font.PLAIN, 14)); * setLayout(gridbag); * * c.fill = GridBagConstraints.BOTH; * c.weightx = 1.0; * makebutton("Button1", gridbag, c); * makebutton("Button2", gridbag, c); * makebutton("Button3", gridbag, c); * * c.gridwidth = GridBagConstraints.REMAINDER; //end row * makebutton("Button4", gridbag, c); * * c.weightx = 0.0; //reset to the default * makebutton("Button5", gridbag, c); //another row * * c.gridwidth = GridBagConstraints.RELATIVE; //next-to-last in row * makebutton("Button6", gridbag, c); * * c.gridwidth = GridBagConstraints.REMAINDER; //end row * makebutton("Button7", gridbag, c); * * c.gridwidth = 1; //reset to the default * c.gridheight = 2; * c.weighty = 1.0; * makebutton("Button8", gridbag, c); * * c.weighty = 0.0; //reset to the default * c.gridwidth = GridBagConstraints.REMAINDER; //end row * c.gridheight = 1; //reset to the default * makebutton("Button9", gridbag, c); * makebutton("Button10", gridbag, c); * * setSize(300, 100); * } * * public static void main(String args[]) { * Frame f = new Frame("GridBag Layout Example"); * GridBagEx1 ex1 = new GridBagEx1(); * * ex1.init(); * * f.add("Center", ex1); * f.pack(); * f.setSize(f.getPreferredSize()); * f.show(); * } * } * </pre></blockquote><hr> * <p> * @version 1.5, 16 Nov 1995 * @author Doug Stein * @see java.awt.GridBagConstraints * @since JDK1.0 */ public class GridBagLayout implements LayoutManager2, java.io.Serializable { /** * The maximum number of grid positions (both horizontally and * vertically) that can be laid out by the grid bag layout. * @since JDK1.0 */ protected static final int MAXGRIDSIZE = 512; /** * The smallest grid that can be laid out by the grid bag layout. * @since JDK1.0 */ protected static final int MINSIZE = 1; protected static final int PREFERREDSIZE = 2; protected Hashtable comptable; protected GridBagConstraints defaultConstraints; protected GridBagLayoutInfo layoutInfo; public int columnWidths[]; public int rowHeights[]; public double columnWeights[]; public double rowWeights[]; /** * Creates a grid bag layout manager. * @since JDK1.0 */ public GridBagLayout () { comptable = new Hashtable(); defaultConstraints = new GridBagConstraints(); } /** * Sets the constraints for the specified component in this layout. * @param comp the component to be modified. * @param constraints the constraints to be applied. * @since JDK1.0 */ public void setConstraints(Component comp, GridBagConstraints constraints) { comptable.put(comp, constraints.clone()); } /** * Gets the constraints for the specified component. A copy of * the actual <code>GridBagConstraints</code> object is returned. * @param comp the component to be queried. * @return the constraint for the specified component in this * grid bag layout; a copy of the actual constraint * object is returned. * @since JDK1.0 */ public GridBagConstraints getConstraints(Component comp) { GridBagConstraints constraints = (GridBagConstraints)comptable.get(comp); if (constraints == null) { setConstraints(comp, defaultConstraints); constraints = (GridBagConstraints)comptable.get(comp); } return (GridBagConstraints)constraints.clone(); } /** * Retrieves the constraints for the specified component. * The return value is not a copy, but is the actual * <code>GridBagConstraints</code> object used by the layout mechanism. * @param comp the component to be queried * @return the contraints for the specified component. * @since JDK1.0 */ protected GridBagConstraints lookupConstraints(Component comp) { GridBagConstraints constraints = (GridBagConstraints)comptable.get(comp); if (constraints == null) { setConstraints(comp, defaultConstraints); constraints = (GridBagConstraints)comptable.get(comp); } return constraints; } /** * Determines the origin of the layout grid. * Most applications do not call this method directly. * @return the origin of the cell in the top-left * corner of the layout grid. * @since JDK1.1 */ public Point getLayoutOrigin () { Point origin = new Point(0,0); if (layoutInfo != null) { origin.x = layoutInfo.startx; origin.y = layoutInfo.starty; } return origin; } /** * Determines column widths and row heights for the layout grid. * <p> * Most applications do not call this method directly. * @return an array of two arrays, containing the widths * of the layout columns and * the heights of the layout rows. * @since JDK1.1 */ public int [][] getLayoutDimensions () { if (layoutInfo == null) return new int[2][0]; int dim[][] = new int [2][]; dim[0] = new int[layoutInfo.width]; dim[1] = new int[layoutInfo.height]; System.arraycopy(layoutInfo.minWidth, 0, dim[0], 0, layoutInfo.width); System.arraycopy(layoutInfo.minHeight, 0, dim[1], 0, layoutInfo.height); return dim; } /** * Determines the weights of the layout grid's columns and rows. * Weights are used to calculate how much a given column or row * stretches beyond its preferred size, if the layout has extra * room to fill. * <p> * Most applications do not call this method directly. * @return an array of two arrays, representing the * horizontal weights of the layout columns * and the vertical weights of the layout rows. * @since JDK1.1 */ public double [][] getLayoutWeights () { if (layoutInfo == null) return new double[2][0]; double weights[][] = new double [2][]; weights[0] = new double[layoutInfo.width]; weights[1] = new double[layoutInfo.height]; System.arraycopy(layoutInfo.weightX, 0, weights[0], 0, layoutInfo.width); System.arraycopy(layoutInfo.weightY, 0, weights[1], 0, layoutInfo.height); return weights; } /** * Determines which cell in the layout grid contains the point * specified by <code>(x, y)</code>. Each cell is identified * by its column index (ranging from 0 to the number of columns * minus 1) and its row index (ranging from 0 to the number of * rows minus 1). * <p> * If the <code>(x, y)</code> point lies * outside the grid, the following rules are used. * The column index is returned as zero if <code>x</code> lies to the * left of the layout, and as the number of columns if <code>x</code> lies * to the right of the layout. The row index is returned as zero * if <code>y</code> lies above the layout, * and as the number of rows if <code>y</code> lies * below the layout. * @param x the <i>x</i> coordinate of a point. * @param y the <i>y</i> coordinate of a point. * @return an ordered pair of indexes that indicate which cell * in the layout grid contains the point * (<i>x</i>, <i>y</i>). * @since JDK1.1 */ public Point location(int x, int y) { Point loc = new Point(0,0); int i, d; if (layoutInfo == null) return loc; d = layoutInfo.startx; for (i=0; i<layoutInfo.width; i++) { d += layoutInfo.minWidth[i]; if (d > x) break; } loc.x = i; d = layoutInfo.starty; for (i=0; i<layoutInfo.height; i++) { d += layoutInfo.minHeight[i]; if (d > y) break; } loc.y = i; return loc; } /** * Adds the specified component with the specified name to the layout. * @param name the name of the component. * @param comp the component to be added. * @since JDK1.0 */ public void addLayoutComponent(String name, Component comp) { } /** * Adds the specified component to the layout, using the specified * constraint object. * @param comp the component to be added. * @param constraints an object that determines how * the component is added to the layout. * @since JDK1.0 */ public void addLayoutComponent(Component comp, Object constraints) { if (constraints instanceof GridBagConstraints) { setConstraints(comp, (GridBagConstraints)constraints); }else if (constraints instanceof String){ //Netscape : Just Ignore it }else if (constraints != null) { throw new IllegalArgumentException("cannot add to layout: constraint must be a GridBagConstraint"); } } /** * Removes the specified component from this layout. * <p> * Most applications do not call this method directly. * @param comp the component to be removed. * @see java.awt.Container#remove(java.awt.Component) * @see java.awt.Container#removeAll() * @since JDK1.0 */ public void removeLayoutComponent(Component comp) { } /** * Determines the preferred size of the <code>target</code> * container using this grid bag layout. * <p> * Most applications do not call this method directly. * @param target the container in which to do the layout. * @see java.awt.Container#getPreferredSize * @since JDK1.0 */ public Dimension preferredLayoutSize(Container parent) { GridBagLayoutInfo info = GetLayoutInfo(parent, PREFERREDSIZE); return GetMinSize(parent, info); } /** * Determines the minimum size of the <code>target</code> container * using this grid bag layout. * <p> * Most applications do not call this method directly. * @param target the container in which to do the layout. * @see java.awt.Container#doLayout * @since JDK1.0 */ public Dimension minimumLayoutSize(Container parent) { GridBagLayoutInfo info = GetLayoutInfo(parent, MINSIZE); return GetMinSize(parent, info); } /** * Returns the maximum dimensions for this layout given the components * in the specified target container. * @param target the component which needs to be laid out * @see Container * @see #minimumLayoutSize * @see #preferredLayoutSize */ public Dimension maximumLayoutSize(Container target) { return new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE); } /** * Returns the alignment along the x axis. This specifies how * the component would like to be aligned relative to other * components. The value should be a number between 0 and 1 * where 0 represents alignment along the origin, 1 is aligned * the furthest away from the origin, 0.5 is centered, etc. */ public float getLayoutAlignmentX(Container parent) { return 0.5f; } /** * Returns the alignment along the y axis. This specifies how * the component would like to be aligned relative to other * components. The value should be a number between 0 and 1 * where 0 represents alignment along the origin, 1 is aligned * the furthest away from the origin, 0.5 is centered, etc. */ public float getLayoutAlignmentY(Container parent) { return 0.5f; } /** * Invalidates the layout, indicating that if the layout manager * has cached information it should be discarded. */ public void invalidateLayout(Container target) { } /** * Lays out the specified container using this grid bag layout. * This method reshapes components in the specified container in * order to satisfy the contraints of this <code>GridBagLayout</code> * object. * <p> * Most applications do not call this method directly. * @param parent the container in which to do the layout. * @see java.awt.Container * @see java.awt.Container#doLayout * @since JDK1.0 */ public void layoutContainer(Container parent) { ArrangeGrid(parent); } /** * Returns a string representation of this grid bag layout's values. * @return a string representation of this grid bag layout. * @since JDK1.0 */ public String toString() { return getClass().getName(); } /** * Print the layout information. Useful for debugging. */ /* DEBUG * * protected void DumpLayoutInfo(GridBagLayoutInfo s) { * int x; * * System.out.println("Col\tWidth\tWeight"); * for (x=0; x<s.width; x++) { * System.out.println(x + "\t" + * s.minWidth[x] + "\t" + * s.weightX[x]); * } * System.out.println("Row\tHeight\tWeight"); * for (x=0; x<s.height; x++) { * System.out.println(x + "\t" + * s.minHeight[x] + "\t" + * s.weightY[x]); * } * } */ /** * Print the layout constraints. Useful for debugging. */ /* DEBUG * * protected void DumpConstraints(GridBagConstraints constraints) { * System.out.println( * "wt " + * constraints.weightx + * " " + * constraints.weighty + * ", " + * * "box " + * constraints.gridx + * " " + * constraints.gridy + * " " + * constraints.gridwidth + * " " + * constraints.gridheight + * ", " + * * "min " + * constraints.minWidth + * " " + * constraints.minHeight + * ", " + * * "pad " + * constraints.insets.bottom + * " " + * constraints.insets.left + * " " + * constraints.insets.right + * " " + * constraints.insets.top + * " " + * constraints.ipadx + * " " + * constraints.ipady); * } */ /* * Fill in an instance of the above structure for the current set * of managed children. This requires three passes through the * set of children: * * 1) Figure out the dimensions of the layout grid * 2) Determine which cells the components occupy * 3) Distribute the weights and min sizes amoung the rows/columns. * * This also caches the minsizes for all the children when they are * first encountered (so subsequent loops don't need to ask again). */ protected GridBagLayoutInfo GetLayoutInfo(Container parent, int sizeflag) { synchronized (parent.getTreeLock()) { GridBagLayoutInfo r = new GridBagLayoutInfo(); Component comp; GridBagConstraints constraints; Dimension d; Component components[] = parent.getComponents(); int compindex, i, j, k, px, py, pixels_diff, nextSize; int curX, curY, curWidth, curHeight, curRow, curCol; double weight_diff, weight, start, size; int xMax[], yMax[]; /* * Pass #1 * * Figure out the dimensions of the layout grid (use a value of 1 for * zero or negative widths and heights). */ r.width = r.height = 0; curRow = curCol = -1; xMax = new int[MAXGRIDSIZE]; yMax = new int[MAXGRIDSIZE]; for (compindex = 0 ; compindex < components.length ; compindex++) { comp = components[compindex]; if (!comp.isVisible()) continue; constraints = lookupConstraints(comp); curX = constraints.gridx; curY = constraints.gridy; curWidth = constraints.gridwidth; if (curWidth <= 0) curWidth = 1; curHeight = constraints.gridheight; if (curHeight <= 0) curHeight = 1; /* If x or y is negative, then use relative positioning: */ if (curX < 0 && curY < 0) { if (curRow >= 0) curY = curRow; else if (curCol >= 0) curX = curCol; else curY = 0; } if (curX < 0) { px = 0; for (i = curY; i < (curY + curHeight); i++) px = Math.max(px, xMax[i]); curX = px - curX - 1; if(curX < 0) curX = 0; } else if (curY < 0) { py = 0; for (i = curX; i < (curX + curWidth); i++) py = Math.max(py, yMax[i]); curY = py - curY - 1; if(curY < 0) curY = 0; } /* Adjust the grid width and height */ for (px = curX + curWidth; r.width < px; r.width++); for (py = curY + curHeight; r.height < py; r.height++); /* Adjust the xMax and yMax arrays */ for (i = curX; i < (curX + curWidth); i++) { yMax[i] = py; } for (i = curY; i < (curY + curHeight); i++) { xMax[i] = px; } /* Cache the current slave's size. */ if (sizeflag == PREFERREDSIZE) d = comp.getPreferredSize(); else d = comp.getMinimumSize(); constraints.minWidth = d.width; constraints.minHeight = d.height; /* Zero width and height must mean that this is the last item (or * else something is wrong). */ if (constraints.gridheight == 0 && constraints.gridwidth == 0) curRow = curCol = -1; /* Zero width starts a new row */ if (constraints.gridheight == 0 && curRow < 0) curCol = curX + curWidth; /* Zero height starts a new column */ else if (constraints.gridwidth == 0 && curCol < 0) curRow = curY + curHeight; } /* * Apply minimum row/column dimensions */ if (columnWidths != null && r.width < columnWidths.length) r.width = columnWidths.length; if (rowHeights != null && r.height < rowHeights.length) r.height = rowHeights.length; /* * Pass #2 * * Negative values for gridX are filled in with the current x value. * Negative values for gridY are filled in with the current y value. * Negative or zero values for gridWidth and gridHeight end the current * row or column, respectively. */ curRow = curCol = -1; xMax = new int[MAXGRIDSIZE]; yMax = new int[MAXGRIDSIZE]; for (compindex = 0 ; compindex < components.length ; compindex++) { comp = components[compindex]; if (!comp.isVisible()) continue; constraints = lookupConstraints(comp); curX = constraints.gridx; curY = constraints.gridy; curWidth = constraints.gridwidth; curHeight = constraints.gridheight; /* If x or y is negative, then use relative positioning: */ if (curX < 0 && curY < 0) { if(curRow >= 0) curY = curRow; else if(curCol >= 0) curX = curCol; else curY = 0; } if (curX < 0) { if (curHeight <= 0) { curHeight += r.height - curY; if (curHeight < 1) curHeight = 1; } px = 0; for (i = curY; i < (curY + curHeight); i++) px = Math.max(px, xMax[i]); curX = px - curX - 1; if(curX < 0) curX = 0; } else if (curY < 0) { if (curWidth <= 0) { curWidth += r.width - curX; if (curWidth < 1) curWidth = 1; } py = 0; for (i = curX; i < (curX + curWidth); i++) py = Math.max(py, yMax[i]); curY = py - curY - 1; if(curY < 0) curY = 0; } if (curWidth <= 0) { curWidth += r.width - curX; if (curWidth < 1) curWidth = 1; } if (curHeight <= 0) { curHeight += r.height - curY; if (curHeight < 1) curHeight = 1; } px = curX + curWidth; py = curY + curHeight; for (i = curX; i < (curX + curWidth); i++) { yMax[i] = py; } for (i = curY; i < (curY + curHeight); i++) { xMax[i] = px; } /* Make negative sizes start a new row/column */ if (constraints.gridheight == 0 && constraints.gridwidth == 0) curRow = curCol = -1; if (constraints.gridheight == 0 && curRow < 0) curCol = curX + curWidth; else if (constraints.gridwidth == 0 && curCol < 0) curRow = curY + curHeight; /* Assign the new values to the gridbag slave */ constraints.tempX = curX; constraints.tempY = curY; constraints.tempWidth = curWidth; constraints.tempHeight = curHeight; } /* * Apply minimum row/column dimensions and weights */ if (columnWidths != null) System.arraycopy(columnWidths, 0, r.minWidth, 0, columnWidths.length); if (rowHeights != null) System.arraycopy(rowHeights, 0, r.minHeight, 0, rowHeights.length); if (columnWeights != null) System.arraycopy(columnWeights, 0, r.weightX, 0, columnWeights.length); if (rowWeights != null) System.arraycopy(rowWeights, 0, r.weightY, 0, rowWeights.length); /* * Pass #3 * * Distribute the minimun widths and weights: */ nextSize = Integer.MAX_VALUE; for (i = 1; i != Integer.MAX_VALUE; i = nextSize, nextSize = Integer.MAX_VALUE) { for (compindex = 0 ; compindex < components.length ; compindex++) { comp = components[compindex]; if (!comp.isVisible()) continue; constraints = lookupConstraints(comp); if (constraints.tempWidth == i) { px = constraints.tempX + constraints.tempWidth; /* right column */ /* * Figure out if we should use this slave\'s weight. If the weight * is less than the total weight spanned by the width of the cell, * then discard the weight. Otherwise split the difference * according to the existing weights. */ weight_diff = constraints.weightx; for (k = constraints.tempX; k < px; k++) weight_diff -= r.weightX[k]; if (weight_diff > 0.0) { weight = 0.0; for (k = constraints.tempX; k < px; k++) weight += r.weightX[k]; for (k = constraints.tempX; weight > 0.0 && k < px; k++) { double wt = r.weightX[k]; double dx = (wt * weight_diff) / weight; r.weightX[k] += dx; weight_diff -= dx; weight -= wt; } /* Assign the remainder to the rightmost cell */ r.weightX[px-1] += weight_diff; } /* * Calculate the minWidth array values. * First, figure out how wide the current slave needs to be. * Then, see if it will fit within the current minWidth values. * If it will not fit, add the difference according to the * weightX array. */ pixels_diff = constraints.minWidth + constraints.ipadx + constraints.insets.left + constraints.insets.right; for (k = constraints.tempX; k < px; k++) pixels_diff -= r.minWidth[k]; if (pixels_diff > 0) { weight = 0.0; for (k = constraints.tempX; k < px; k++) weight += r.weightX[k]; for (k = constraints.tempX; weight > 0.0 && k < px; k++) { double wt = r.weightX[k]; int dx = (int)((wt * ((double)pixels_diff)) / weight); r.minWidth[k] += dx; pixels_diff -= dx; weight -= wt; } /* Any leftovers go into the rightmost cell */ r.minWidth[px-1] += pixels_diff; } } else if (constraints.tempWidth > i && constraints.tempWidth < nextSize) nextSize = constraints.tempWidth; if (constraints.tempHeight == i) { py = constraints.tempY + constraints.tempHeight; /* bottom row */ /* * Figure out if we should use this slave\'s weight. If the weight * is less than the total weight spanned by the height of the cell, * then discard the weight. Otherwise split it the difference * according to the existing weights. */ weight_diff = constraints.weighty; for (k = constraints.tempY; k < py; k++) weight_diff -= r.weightY[k]; if (weight_diff > 0.0) { weight = 0.0; for (k = constraints.tempY; k < py; k++) weight += r.weightY[k]; for (k = constraints.tempY; weight > 0.0 && k < py; k++) { double wt = r.weightY[k]; double dy = (wt * weight_diff) / weight; r.weightY[k] += dy; weight_diff -= dy; weight -= wt; } /* Assign the remainder to the bottom cell */ r.weightY[py-1] += weight_diff; } /* * Calculate the minHeight array values. * First, figure out how tall the current slave needs to be. * Then, see if it will fit within the current minHeight values. * If it will not fit, add the difference according to the * weightY array. */ pixels_diff = constraints.minHeight + constraints.ipady + constraints.insets.top + constraints.insets.bottom; for (k = constraints.tempY; k < py; k++) pixels_diff -= r.minHeight[k]; if (pixels_diff > 0) { weight = 0.0; for (k = constraints.tempY; k < py; k++) weight += r.weightY[k]; for (k = constraints.tempY; weight > 0.0 && k < py; k++) { double wt = r.weightY[k]; int dy = (int)((wt * ((double)pixels_diff)) / weight); r.minHeight[k] += dy; pixels_diff -= dy; weight -= wt; } /* Any leftovers go into the bottom cell */ r.minHeight[py-1] += pixels_diff; } } else if (constraints.tempHeight > i && constraints.tempHeight < nextSize) nextSize = constraints.tempHeight; } } return r; } } /* * Adjusts the x, y, width, and height fields to the correct * values depending on the constraint geometry and pads. */ protected void AdjustForGravity(GridBagConstraints constraints, Rectangle r) { int diffx, diffy; r.x += constraints.insets.left; r.width -= (constraints.insets.left + constraints.insets.right); r.y += constraints.insets.top; r.height -= (constraints.insets.top + constraints.insets.bottom); diffx = 0; if ((constraints.fill != GridBagConstraints.HORIZONTAL && constraints.fill != GridBagConstraints.BOTH) && (r.width > (constraints.minWidth + constraints.ipadx))) { diffx = r.width - (constraints.minWidth + constraints.ipadx); r.width = constraints.minWidth + constraints.ipadx; } diffy = 0; if ((constraints.fill != GridBagConstraints.VERTICAL && constraints.fill != GridBagConstraints.BOTH) && (r.height > (constraints.minHeight + constraints.ipady))) { diffy = r.height - (constraints.minHeight + constraints.ipady); r.height = constraints.minHeight + constraints.ipady; } switch (constraints.anchor) { case GridBagConstraints.CENTER: r.x += diffx/2; r.y += diffy/2; break; case GridBagConstraints.NORTH: r.x += diffx/2; break; case GridBagConstraints.NORTHEAST: r.x += diffx; break; case GridBagConstraints.EAST: r.x += diffx; r.y += diffy/2; break; case GridBagConstraints.SOUTHEAST: r.x += diffx; r.y += diffy; break; case GridBagConstraints.SOUTH: r.x += diffx/2; r.y += diffy; break; case GridBagConstraints.SOUTHWEST: r.y += diffy; break; case GridBagConstraints.WEST: r.y += diffy/2; break; case GridBagConstraints.NORTHWEST: break; default: throw new IllegalArgumentException("illegal anchor value"); } } /* * Figure out the minimum size of the * master based on the information from GetLayoutInfo() */ protected Dimension GetMinSize(Container parent, GridBagLayoutInfo info) { Dimension d = new Dimension(); int i, t; Insets insets = parent.getInsets(); t = 0; for(i = 0; i < info.width; i++) t += info.minWidth[i]; d.width = t + insets.left + insets.right; t = 0; for(i = 0; i < info.height; i++) t += info.minHeight[i]; d.height = t + insets.top + insets.bottom; return d; } /* * Lay out the grid */ protected void ArrangeGrid(Container parent) { Component comp; int compindex; GridBagConstraints constraints; Insets insets = parent.getInsets(); Component components[] = parent.getComponents(); Dimension d; Rectangle r = new Rectangle(); int i, diffw, diffh; double weight; GridBagLayoutInfo info; /* * If the parent has no slaves anymore, then don't do anything * at all: just leave the parent's size as-is. */ if (components.length == 0 && (columnWidths == null || columnWidths.length == 0) && (rowHeights == null || rowHeights.length == 0)) { return; } /* * Pass #1: scan all the slaves to figure out the total amount * of space needed. */ info = GetLayoutInfo(parent, PREFERREDSIZE); d = GetMinSize(parent, info); if (parent.width < d.width || parent.height < d.height) { info = GetLayoutInfo(parent, MINSIZE); d = GetMinSize(parent, info); } layoutInfo = info; r.width = d.width; r.height = d.height; /* * DEBUG * * DumpLayoutInfo(info); * for (compindex = 0 ; compindex < components.length ; compindex++) { * comp = components[compindex]; * if (!comp.isVisible()) * continue; * constraints = lookupConstraints(comp); * DumpConstraints(constraints); * } * System.out.println("minSize " + r.width + " " + r.height); */ /* * If the current dimensions of the window don't match the desired * dimensions, then adjust the minWidth and minHeight arrays * according to the weights. */ diffw = parent.width - r.width; if (diffw != 0) { weight = 0.0; for (i = 0; i < info.width; i++) weight += info.weightX[i]; if (weight > 0.0) { for (i = 0; i < info.width; i++) { int dx = (int)(( ((double)diffw) * info.weightX[i]) / weight); info.minWidth[i] += dx; r.width += dx; if (info.minWidth[i] < 0) { r.width -= info.minWidth[i]; info.minWidth[i] = 0; } } } diffw = parent.width - r.width; } else { diffw = 0; } diffh = parent.height - r.height; if (diffh != 0) { weight = 0.0; for (i = 0; i < info.height; i++) weight += info.weightY[i]; if (weight > 0.0) { for (i = 0; i < info.height; i++) { int dy = (int)(( ((double)diffh) * info.weightY[i]) / weight); info.minHeight[i] += dy; r.height += dy; if (info.minHeight[i] < 0) { r.height -= info.minHeight[i]; info.minHeight[i] = 0; } } } diffh = parent.height - r.height; } else { diffh = 0; } /* * DEBUG * * System.out.println("Re-adjusted:"); * DumpLayoutInfo(info); */ /* * Now do the actual layout of the slaves using the layout information * that has been collected. */ info.startx = diffw/2 + insets.left; info.starty = diffh/2 + insets.top; for (compindex = 0 ; compindex < components.length ; compindex++) { comp = components[compindex]; if (!comp.isVisible()) continue; constraints = lookupConstraints(comp); r.x = info.startx; for(i = 0; i < constraints.tempX; i++) r.x += info.minWidth[i]; r.y = info.starty; for(i = 0; i < constraints.tempY; i++) r.y += info.minHeight[i]; r.width = 0; for(i = constraints.tempX; i < (constraints.tempX + constraints.tempWidth); i++) { r.width += info.minWidth[i]; } r.height = 0; for(i = constraints.tempY; i < (constraints.tempY + constraints.tempHeight); i++) { r.height += info.minHeight[i]; } AdjustForGravity(constraints, r); /* * If the window is too small to be interesting then * unmap it. Otherwise configure it and then make sure * it's mapped. */ if ((r.width <= 0) || (r.height <= 0)) { comp.setBounds(0, 0, 0, 0); } else { if (comp.x != r.x || comp.y != r.y || comp.width != r.width || comp.height != r.height) { comp.setBounds(r.x, r.y, r.width, r.height); } } } } }
⏎ java/awt/GridBagLayout.java
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