关于Editor和Renderer的一点认识
2008-01-05 18:35:01 来源:WEB开发网在Sun的官方网站上对Editor和Renderer的解释是如下:
Renderer:
Instead, a single cell renderer is generally used to draw all of the cells that contain the same type of data. You can think of the renderer as a configurable ink stamp that the table uses to stamp apPRopriately formatted data onto each cell. When the user starts to edit a cell's data, a cell editor takes over the cell, controlling the cell's editing behavior.
个人理解就是对于不同的数据显示不同的格式,相当于在MVC中根据不同的Model选择不同的View,Renderer就是给你这个选择的权利。默认的几种数据的显示方式如下:
Boolean
— rendered with a check box.
Number
— rendered by a right-aligned label.
Double
, Float
— same as Number
, but the object-to-text translation is performed by a NumberFormat
instance (using the default number format for the current locale).
Date
— rendered by a label, with the object-to-text translation performed by a DateFormat
instance (using a short style for the date and time).
ImageIcon
, Icon
— rendered by a centered label.
Object
— rendered by a label that displays the object's string value.假如你有非凡的数据,想有非凡的显示方式,可以自己设定Cell的Renderer如下:
TableCellRenderer weirdRenderer = new WeirdRenderer();
table = new JTable(...) {
public TableCellRenderer getCellRenderer(int row, int column) {
if ((row == 0) && (column == 0)) {
return weirdRenderer;
}
// else...
return super.getCellRenderer(row, column);
}
};
Editor是用于编辑数据,但是Renderer是用于显示数据。
关于Editor,和Renderer遵守相同的法则
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