一個Custom Border
可以實現點劃線的Border.
代碼如下：
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
/**
* DotDashBorder is a java.swing.border.Border implementation
* that draws a dotted and/or dashed line border. The dot/dash pattern is
* defined as an array of ints, with every two indices defining the number
* of pixels for each dot/dash and space. E.g.:
* { 1, 1 } == 1-pixel-dot, 1-pixel-space, 1-pixel-dot, 1-pixel-space, etc.
* { 4, 2 } == 4-pixel-dash, 2-pixel-space, 4-pixel-dash, 2-pixel-space, etc.
*/
public class DotDashBorder extends AbstractBorder {
/**
* Defines a dotted line pattern: . . . .
*/
public static final int[] DOT = { 1, 1 };
/**
* Defines a dashed line pattern: - - - -
*/
public static final int[] DASH_SHORT = { 4, 4 };
/**
* Defines a long dashed line pattern: --- --- ---
*/
public static final int[] DASH_LONG = { 10, 10 };
/**
* Defines a long/short dashed line pattern: -- - -- - -- -
*/
public static final int[] DASH_LONG_SHORT = { 6, 3, 3, 3 };
/**
* Defines a long/short/short dashed line pattern: -- - - -- - - -- - -
*/
public static final int[] DASH_LONG_SHORT_SHORT = { 6, 3, 3, 3, 3, 3 };
/**
* The dot/dash pattern.
*/
private int[] pattern = DOT;
/**
* The border thickness
*/
private int thickness = 1;
/**
* The foreground color. If not specified, the component's foreground
* color is used.
*/
private Color colorFG = null;
/**
* The background color. If not specified, the component's background
* color is used.
*/
private Color colorBG = null;
/**
* Thicken border pattern relative to thickness flag.
*/
private boolean thicken = false;
/**
* Create a new 1-pixel thick DotDashBorder using the component's
* background color.
* @param pattern int[]: the dot/dash-space pattern
* @param fg Color: the foreground (dot/dash) color
*/
public DotDashBorder(int[] pattern, Color fg) {
this(pattern, 1, fg, null);
}
/**
* Create a new DotDashBorder using the component's foreground and
* background colors.
* @param pattern int[]: the dot/dash-space pattern
* @param thickness int: the border thickness
*/
public DotDashBorder(int[] pattern, int thickness) {
this(pattern, thickness, null, null);
}
/**
* Create a new DotDashBorder using the component's
* background color.
* @param pattern int[]: the dot/dash-space pattern
* @param thickness int: the border thickness
* @param fg Color: the foreground (dot/dash) color
*/
public DotDashBorder(int[] pattern, int thickness, Color fg) {
this(pattern, thickness, fg, null);
}
/**
* Create a new DotDashBorder.
* @param pattern int[]: the dot/dash-space pattern
* @param thickness int: the border thickness
* @param fg Color: the foreground (dot/dash) color
* @param bg Color: the background (space) color
*/
public DotDashBorder(int[] pattern, int thickness, Color fg, Color bg) {
for(int i = 0; i < pattern.length; i++) {
if(pattern[i] <= 0) {
throw new IllegalArgumentException("Pattern cannot have values <= 0.");
}
}
this.pattern = pattern;
if(thickness <= 0) {
throw new IllegalArgumentException("Thickness cannot be <= 0.");
}
this.thickness = thickness;
this.colorFG = fg;
this.colorBG = bg;
}
/**
* Get the insets for the border.
* @param Component c: the component the border is for
* @return Insets: the insets for the border
* @see #getBorderInsets(Component, Insets)
*/
public Insets getBorderInsets(Component c) {
return new Insets(thickness, thickness, thickness, thickness);
}
/**
* Get the insets for the border.
* @param Component c: the component the border is for
* @param insets Insets: the insets
* @return Insets: the insets for the border
* @see #getBorderInsets(Component)
*/
public Insets getBorderInsets(Component c, Insets insets) {
return new Insets(thickness, thickness, thickness, thickness);
}
/**
* Check if the border is opaque.
* @return boolean: true if the border is opaque
*/
public boolean isBorderOpaque() {
return true;
}
/**
* Check if pattern will be thickened by thickness.
* @return boolean: true if pattern will be thickened by thickness
* @see #setThickenPattern(boolean)
*/
public boolean isThickenPattern() {
return this.thicken;
}
/**
* Set if the pattern should be thickened by thickness. If true, a
* pattern of { 1, 1 } and thickness of 5, the pattern would be expanded
* to { 5, 5 }. This allows setting a pattern based on small pixel
* measurements that grows proportionally with the thickness.
* @param boolean t: true if pattern should be thickened by thickness
* @see #isThickenPattern()
*/
public void setThickenPattern(boolean t) {
this.thicken = t;
}
/**
* Paint the border.
* @param Component c: the component the border is for
* @param Graphics g: the graphics object to draw on
* @param x int: the border y position
* @param y int: the border x position
* @param width int: the border width
* @param height int: the border height
*/
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
Color colorFGX = c.getBackground();
if(colorFG != null) {
colorFGX = colorFG;
}
Color colorBGX = c.getBackground();
if(colorBG != null) {
colorBGX = colorBG;
}
g.setColor(colorFGX);
g.fillRect(x, x, width, thickness); // top
g.fillRect(x, y+height-thickness, width, thickness); // bottom
g.fillRect(x, y, thickness, height); // left
g.fillRect(x+width-thickness, y, thickness, height); // right
g.setColor(colorBGX);
// top/bottom
int cx = 0;
// get real pattern
int[] realPattern = new int[pattern.length];
for(int i = 0; i < pattern.length; i++) {
if(thicken) {
realPattern[i] = pattern[i]*thickness;
} else {
realPattern[i] = pattern[i];
}
}
for(int i = 0, j = 0; i < width; i++, j+=2) {
if(j >= realPattern.length) {
j = 0;
}
cx += realPattern[j];
g.fillRect(cx, y, realPattern[j+1], thickness); // top
g.fillRect(cx, y+height-thickness, realPattern[j+1], thickness); // bottom
cx += realPattern[j+1];
}
// left/right
int cy = 0;
for(int i = 0, j = 0; i < height; i++, j+=2) {
if(j >= realPattern.length) {
j = 0;
}
cy += realPattern[j];
g.fillRect(x, cy, thickness, realPattern[j+1]); // left
g.fillRect(x+width-thickness, cy, thickness, realPattern[j+1]); // right
cy += realPattern[j+1];
}
}
}
posted on 2005-08-27 10:19
Pudgy's World 閱讀(922)
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