ButtonField 中神秘的额外像素?

发布于 2024-12-04 09:59:22 字数 1950 浏览 4 评论 0原文

我创建了一个非常基本的自定义布局来设置由 ButtonField 组成的菜单。

为了垂直放置它们,我将屏幕分成 6 部分,然后将它们放在 2、3、4 和 5 等分线上,如代码所示。

因此,对于模拟器,Torch,高度为 480 时会看到按钮位于 160,240,320 和 400。

但是,当我检查它们时,它们都低于此值 24 像素,并且似乎没有明显的原因,除非这只是我的典型约定错过了!

package Test;

import net.rim.device.api.system.Display;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.container.VerticalFieldManager;

class MenuLayoutManager extends VerticalFieldManager{

public MenuLayoutManager()
{
    super();
}

public int getPreferredWidth()
{
    int preferredWidth = Display.getWidth();
    return preferredWidth;
}

protected void sublayout(int inMaxWidth, int inMaxHeight)
{
int xCentre = Display.getWidth()/2;
int yGap = Display.getHeight() / 6;
int xPos = 0;
int yPos = yGap * 2;
int fieldNo = this.getFieldCount();

for(int index = 0; index<fieldNo; index++)
{
Field aField = this.getField(index);
this.layoutChild(aField, inMaxWidth, inMaxHeight);
xPos = xCentre - (aField.getWidth() / 2);
this.setPositionChild(aField, xPos, yPos);
yPos += yGap;
}
this.setExtent(inMaxWidth, inMaxHeight);


}
}

------入口点和按钮创建----

package Test;


import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.container.MainScreen;

class MyScreen extends MainScreen
{
public MyScreen(){
super(MainScreen.NO_VERTICAL_SCROLL|MainScreen.NO_VERTICAL_SCROLLBAR);
this.initialize();
}

private void initialize()
{        
    // Set the displayed title of the screen


    this.setTitle(String.valueOf("Ben's Menu"));

    MenuLayoutManager mlm = new MenuLayoutManager();
    ButtonField Button1 = new ButtonField("New Game");
    ButtonField Button2 = new ButtonField("High Scores");
    ButtonField Button3 = new ButtonField("Instructions");
    ButtonField Button4 = new ButtonField("Exit");
    mlm.add(Button1);
    mlm.add(Button2);
    mlm.add(Button3);
    mlm.add(Button4);
    this.add(mlm); 


}



}

I have created a very basic custom layout to set out a menu made up of ButtonFields.

To position them vertically, i split the screen into 6 and then put them at divides 2,3,4 and 5 as is shown in the code.

So for the emulator, the Torch, a Height of 480 would see buttons at 160,240,320 and 400.

However, when I check them, they are all 24 pixels below this, and there seems no obvious reason unless this is just a typical convention I have missed!

package Test;

import net.rim.device.api.system.Display;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.container.VerticalFieldManager;

class MenuLayoutManager extends VerticalFieldManager{

public MenuLayoutManager()
{
    super();
}

public int getPreferredWidth()
{
    int preferredWidth = Display.getWidth();
    return preferredWidth;
}

protected void sublayout(int inMaxWidth, int inMaxHeight)
{
int xCentre = Display.getWidth()/2;
int yGap = Display.getHeight() / 6;
int xPos = 0;
int yPos = yGap * 2;
int fieldNo = this.getFieldCount();

for(int index = 0; index<fieldNo; index++)
{
Field aField = this.getField(index);
this.layoutChild(aField, inMaxWidth, inMaxHeight);
xPos = xCentre - (aField.getWidth() / 2);
this.setPositionChild(aField, xPos, yPos);
yPos += yGap;
}
this.setExtent(inMaxWidth, inMaxHeight);


}
}

------Entry point and button creation----

package Test;


import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.container.MainScreen;

class MyScreen extends MainScreen
{
public MyScreen(){
super(MainScreen.NO_VERTICAL_SCROLL|MainScreen.NO_VERTICAL_SCROLLBAR);
this.initialize();
}

private void initialize()
{        
    // Set the displayed title of the screen


    this.setTitle(String.valueOf("Ben's Menu"));

    MenuLayoutManager mlm = new MenuLayoutManager();
    ButtonField Button1 = new ButtonField("New Game");
    ButtonField Button2 = new ButtonField("High Scores");
    ButtonField Button3 = new ButtonField("Instructions");
    ButtonField Button4 = new ButtonField("Exit");
    mlm.add(Button1);
    mlm.add(Button2);
    mlm.add(Button3);
    mlm.add(Button4);
    this.add(mlm); 


}



}

如果你对这篇内容有疑问,欢迎到本站社区发帖提问 参与讨论,获取更多帮助,或者扫码二维码加入 Web 技术交流群。

扫码二维码加入Web技术交流群

发布评论

需要 登录 才能够评论, 你可以免费 注册 一个本站的账号。

评论(1

你如我软肋 2024-12-11 09:59:22

使用主屏幕,您无法获得分配给屏幕内容的完整显示高度。 (至少,IIRC,有标题和分隔符。)尝试使用全屏,看看会发生什么。

With a MainScreen, you don't get the full display height allocated to the screen contents. (At a minimum, IIRC, there's the title and a separator.) Try using a FullScreen instead and see what happens.

~没有更多了~
我们使用 Cookies 和其他技术来定制您的体验包括您的登录状态等。通过阅读我们的 隐私政策 了解更多相关信息。 单击 接受 或继续使用网站,即表示您同意使用 Cookies 和您的相关数据。
原文