如何自定义ObjectListField？

发布于 2024-09-16 09:16:42 字数 448 浏览 4 评论 0原文

是否可以按照以下设计自定义Objectfieldlist？

         ----------------------------
ROW#1    ROW NAME
         row details
         ---------------------------
ROW#2    ROW NAME
         row details
         ---------------------------  
ROW#3    ROW NAME
         row details
         ---------------------------

行名称的字体将大于行详细信息

基本上我需要在 ObjectListField 的行中包含 2 个文本行。**或任何其他方法或建议，因为我可能是错的，**请指导我它的紧急情况，并且是黑莓的一些新内容发展。

原文

Is it possible to customize Objectfieldlist according to following design?

         ----------------------------
ROW#1    ROW NAME
         row details
         ---------------------------
ROW#2    ROW NAME
         row details
         ---------------------------  
ROW#3    ROW NAME
         row details
         ---------------------------

Row Name will be in bigger font than row details

Basically I need 2 text rows in a Row of ObjectListField.**OR any other method or suggestion as I might be wrong,**pls guide me its urgent and am some what new to Blackberry Development.

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孤城病女 2024-09-23 09:16:42

ObjectListField 并不是真正执行此操作的正确方法 - 它实际上被设计为 ListField 的快速版本，适合您只需要简单的字符串列表的情况。

您应该扩展 ListField 本身，并提供您自己的 ListFieldCallback 实现，以根据您的数据模型呈现列表。使用 ListField.setCallback 设置回调。

ListFieldCallback.drawListRow 为您提供一个 Graphics 上下文，因此您可以绘制任何您想要的内容，包括多行文本。另请确保在列表字段上调用 ListField.setRowHeight 以使行足够高以容纳 2 行文本（默认高度是字体高度，因此您只能容纳 1 行文本））。

示例代码类似于（这并不完整，如果没有其他代码就无法编译）：

ListField myListField = new ListField();
myListField.setRowHeight(getFont().getHeight() * 2)

myListField.setCallback(new ListFieldCallback() {
    public void drawListRow(ListField listField, Graphics graphics, int index, int y, int width) {
       // draw the first line of text
       graphics.drawText(0, y, "ROW " + rowNumber);
       graphics.drawText(20, y, "ROW NAME");
       graphics.drawText(20, y + getFont().getHeight(), "row details"); 
    }

ObjectListField isn't really the right way to do this - it's really designed as a quick version of ListField for those times when you just need a simple list of strings.

You should extend ListField itself, and provide your own implementation of ListFieldCallback that renders your list based on your data model. Use ListField.setCallback to set your callback.

ListFieldCallback.drawListRow gives you a Graphics context, so you can draw whatever you want, including multiple lines of text. Also make sure to call ListField.setRowHeight on your listfield to make the rows high enough for 2 lines of text (the default height is the font height, so you'd only have room for 1 line of text).

Sample code is something like (this is not complete and will not compile without some other code):

ListField myListField = new ListField();
myListField.setRowHeight(getFont().getHeight() * 2)

myListField.setCallback(new ListFieldCallback() {
    public void drawListRow(ListField listField, Graphics graphics, int index, int y, int width) {
       // draw the first line of text
       graphics.drawText(0, y, "ROW " + rowNumber);
       graphics.drawText(20, y, "ROW NAME");
       graphics.drawText(20, y + getFont().getHeight(), "row details"); 
    }

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