| Constructors Summary |
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public MultiLineLabel(String label, int margin_width, int margin_height, Alignment alignment) // Have the lines been measured?
// Here are five versions of the constructor.
this.label = label; // Remember all the properties.
this.margin_width = margin_width;
this.margin_height = margin_height;
this.alignment = alignment;
newLabel(); // Break the label up into lines.
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public MultiLineLabel(String label, int margin_width, int margin_height)
this(label, margin_width, margin_height, Alignment.LEFT);
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public MultiLineLabel(String label, Alignment alignment)
this(label, 10, 10, alignment);
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public MultiLineLabel(String label) this(label, 10, 10, Alignment.LEFT);
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public MultiLineLabel() this("");
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| Methods Summary |
|---|
| public Alignment | getAlignment() return alignment;
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| public java.lang.String | getLabel() return label;
|
| public int | getMarginHeight() return margin_height;
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| public int | getMarginWidth() return margin_width;
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| public java.awt.Dimension | getMinimumSize()This method is called when the layout manager wants to know
the bare minimum amount of space we need to get by. return getPreferredSize();
|
| public java.awt.Dimension | getPreferredSize()This method is called by a layout manager when it wants to
know how big we'd like to be.
if (!measured) measure();
return new Dimension(max_width + 2*margin_width,
num_lines * line_height + 2*margin_height);
|
| protected synchronized void | measure()This internal method figures out how the font is, and how wide each
line of the label is, and how wide the widest line is.
FontMetrics fm = this.getFontMetrics(this.getFont());
line_height = fm.getHeight();
line_ascent = fm.getAscent();
max_width = 0;
for(int i = 0; i < num_lines; i++) {
line_widths[i] = fm.stringWidth(lines[i]);
if (line_widths[i] > max_width) max_width = line_widths[i];
}
measured = true;
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| protected synchronized void | newLabel()This internal method breaks a specified label up into an array of lines.
It uses the StringTokenizer utility class.
StringTokenizer t = new StringTokenizer(label, "\n");
num_lines = t.countTokens();
lines = new String[num_lines];
line_widths = new int[num_lines];
for(int i = 0; i < num_lines; i++) lines[i] = t.nextToken();
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| public void | paintComponent(java.awt.Graphics g)This method draws the component.
Note that it handles the margins and the alignment, but that
it doesn't have to worry about the color or font--the superclass
takes care of setting those in the Graphics object we're passed.
int x, y;
Dimension size = this.getSize();
if (!measured) measure();
y = line_ascent + (size.height - num_lines * line_height)/2;
for(int i = 0; i < num_lines; i++, y += line_height) {
if (alignment == Alignment.LEFT) x = margin_width;
else if (alignment == Alignment.CENTER)
x = (size.width - line_widths[i])/2;
else x = size.width - margin_width - line_widths[i];
g.drawString(lines[i], x, y);
}
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| public void | setAlignment(Alignment a) alignment = a; repaint();
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| public void | setFont(java.awt.Font f)
super.setFont(f); // Tell our superclass about the new font.
repaint(); // Request a redraw.
measured = false; // Note that we need to remeasure lines.
invalidate(); // Tell our containers about new size
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| public void | setLabel(java.lang.String label)
this.label = label;
newLabel(); // Break the label into lines.
repaint(); // Request a redraw.
measured = false; // Note that we need to measure lines.
invalidate(); // Tell our containers about this
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| public void | setMarginHeight(int mh) margin_height = mh; repaint();
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| public void | setMarginWidth(int mw) margin_width = mw; repaint();
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