【发布时间】：2013-12-03 19:45:04
【问题描述】：
我现在有一个很奇怪的问题。
基本上，当我在屏幕中滚动时，这些字段不会完全或一致地重绘。
我有一个屏幕 (NO_VERTICAL_SCROLL)，标题栏是经理。在此之下，我有一个带有标签字段的垂直字段管理器 (VERTICAL_SCROLL)。当我滚动 vfm 时，已经可见的一两行标签字段被重新绘制。我向下滚动到的部分完全没有绘制任何内容。
我尝试了 invalidate()，并在 scrollchangelistener 中调用了 doPaint，但实际上情况更糟。这会导致标题栏仅被部分重绘。
在下面的代码中，我使用了自定义的FontManager、DimenManager 和ImageResourceManager 来返回取决于屏幕大小的值。我使用了自定义的BitmapButtonField 和ClickableLabel，以便在单击时更改字段的状态。
public class BaseScreen extends MainScreen implements StringsResource
{
protected ResourceBundle resources;
public BaseScreen(long style)
{
super(style);
StandardTitleBar titlebar = new StandardTitleBar();
titlebar.addSignalIndicator();
titlebar.addClock();
titlebar.addNotifications();
setTitle(titlebar);
resources = ResourceBundle.getBundle(BUNDLE_ID, BUNDLE_NAME);
}
}
public class TandCScreen extends BaseScreen
{
final String copy_text1 = "long text here";
final String copy_text2 = "even longer text here";
ColoredLabelField label_title;
ColoredLabelField label_subtitle;
ColoredLabelField label1;
ColoredLabelField label2;
ClickableLabel label3;
public TandCScreen()
{
super(NO_VERTICAL_SCROLL | NO_VERTICAL_SCROLLBAR);
label_title = new ColoredLabelField(resources.getString(STRING_APP_NAME), Color.WHITE, DrawStyle.HCENTER | USE_ALL_WIDTH);
label_title.setBackground(BackgroundFactory.createSolidBackground(0x60223b));
label_subtitle = new ColoredLabelField(resources.getString(STRING_TANDC_TITLE), 0x58585b, DrawStyle.HCENTER | USE_ALL_WIDTH);
label1 = new ColoredLabelField(copy_text1, 0x58585b, USE_ALL_WIDTH);
label2 = new ColoredLabelField("", 0xa7a9ab, USE_ALL_WIDTH);
label3 = new ClickableLabel("Read more...")
{
protected void unclick()
{
super.unclick();
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
ColoredLabelField label = new ColoredLabelField(copy_text2, 0xa7a9ab, 0);
label.setFont(FontManager.body());
label.setMargin(0, 0, DimenManager.interField(), 0);
label2.getManager().replace(label2, label);
label3.getManager().delete(label3);
}
});
}
};
label_title.setFont(FontManager.subtitle());
label_subtitle.setFont(FontManager.subtitle());
label1.setFont(FontManager.body());
label2.setFont(FontManager.body());
label3.setFont(FontManager.body());
BitmapButtonField button_accept = new BitmapButtonField(ImageResourceManager.buttonAccept(), ImageResourceManager.buttonAcceptHover(), FIELD_HCENTER)
{
protected void click()
{
super.click();
setImage(ImageResourceManager.buttonAcceptSelected());
setFocusImage(ImageResourceManager.buttonAcceptSelected());
}
protected void unclick()
{
super.unclick();
PersistentStoreManager.setTandCAccepted(true);
UiApplication.getUiApplication().pushScreen(new LoginScreen());
close();
}
};
BitmapButtonField button_decline = new BitmapButtonField(ImageResourceManager.buttonDecline(), ImageResourceManager.buttonDeclineHover(), FIELD_HCENTER)
{
protected void click()
{
super.click();
setImage(ImageResourceManager.buttonDeclineSelected());
setFocusImage(ImageResourceManager.buttonDeclineSelected());
}
protected void unclick()
{
super.unclick();
close();
}
};
int margin = (VariableManager.DISPLAY_WIDTH - button_accept.getPreferredWidth()) / 2;
// calculate where to put ellipsis
Font font = label2.getFont();
int max_length = (VariableManager.DISPLAY_WIDTH - margin * 2) * 2;
int i = copy_text2.length() - 1;
while (font.getAdvance(copy_text2.substring(0, i)) + font.getAdvance("...") >= max_length)
i--;
label2.setText(copy_text2.substring(0, i).trim() + "...");
VerticalFieldManager vfm = new VerticalFieldManager(VERTICAL_SCROLL | VERTICAL_SCROLLBAR);
vfm.add(new NullField());
vfm.add(label_subtitle);
vfm.add(new Seperator());
vfm.add(label1);
vfm.add(label2);
vfm.add(label3);
vfm.add(button_accept);
vfm.add(button_decline);
vfm.setMargin(0, margin, 0, margin);
// paddings
int padding = (DimenManager.header() - label_title.getPreferredHeight()) / 2;
label_title.setPadding(padding, 0, padding, 0);
label_subtitle.setPadding(DimenManager.interField(), 0, DimenManager.interField(), 0);
label1.setMargin(DimenManager.interField(), 0, DimenManager.interField(), 0);
label3.setMargin(DimenManager.interField(), 0, DimenManager.interField(), button_accept.getPreferredWidth() - label3.getPreferredWidth());
button_decline.setMargin(DimenManager.interField(), 0, DimenManager.interButton(), 0);
add(label_title);
add(vfm);
}
protected boolean onSavePrompt()
{
return false;
}
protected void makeMenu(Menu menu, int instance)
{
if (instance == Menu.INSTANCE_CONTEXT)
{
ContextMenu contextMenu = ContextMenu.getInstance();
contextMenu.setTarget(this);
contextMenu.clear();
this.makeContextMenu(contextMenu);
menu.deleteAll();
menu.add(contextMenu);
}
else
{
super.makeMenu(menu, instance);
}
}
protected void makeContextMenu(ContextMenu contextMenu)
{
}
/**
* Clickable labelfield which changes color on down press, and fires action
* on release. Action is canceled if touch moves outside field bounds.
*
* @author kevin
*
*/
private class ClickableLabel extends LabelField
{
private boolean canceled = true;
private boolean consumed = false;
protected boolean pressed = false;
public ClickableLabel(String label)
{
super(label, LabelField.FOCUSABLE | USE_ALL_WIDTH);
setFont(FontManager.body());
}
protected void paint(Graphics g)
{
// background
if (pressed)
{
g.setColor(0x2C1721);
}
else if (isFocus())
{
g.setColor(0x993C6B);
}
else
{
g.setColor(0x60223B);
}
int padding_y = (getPreferredHeight() - getFont().getHeight()) / 2;
int padding_x = getPaddingLeft();
g.drawText(getText(), padding_x, padding_y);
}
public int getPreferredHeight()
{
return ImageResourceManager.highlight().getHeight();
}
protected void layout(int width, int height)
{
height = getPreferredHeight();
super.layout(width, height);
setExtent(width, height);
}
// --------- Highlight selected row ---------
protected void onFocus(int direction)
{
super.onFocus(direction);
invalidate();
}
protected void onUnfocus()
{
super.onUnfocus();
invalidate();
}
// --------------------------------------------
protected void drawFocus(Graphics graphics, boolean on)
{
}
/**
* Called when trackpad pressed, or touchscreen touched
*/
protected void click()
{
pressed = true;
invalidate();
}
/**
* Called when trackpad released, or touchscreen released
*/
protected void unclick()
{
cancel();
}
protected void cancel()
{
pressed = false;
invalidate();
}
protected boolean navigationClick(int status, int time)
{
if (status != 0)
{
if (consumed)
{
consumed = false;
}
else
{
click();
}
}
return true;
}
protected boolean navigationUnclick(int status, int time)
{
if (status != 0)
{
if (consumed)
consumed = false;
else
unclick();
}
return true;
}
protected boolean touchEvent(TouchEvent message)
{
int x = message.getX(1);
int y = message.getY(1);
if (x < 0 || y < 0 || x > getExtent().width || y > getExtent().height)
{
// Outside the field
if (!canceled)
{
cancel();
}
canceled = true;
return false;
}
if (message.getEvent() == TouchEvent.UP)
{
if (canceled)
cancel();
else
unclick();
consumed = true;
return true;
}
if (message.getEvent() == TouchEvent.DOWN)
{
click();
consumed = true;
canceled = false;
return true;
}
return super.touchEvent(message);
}
}
private class Seperator extends SeparatorField
{
protected void paint(Graphics graphics)
{
graphics.setColor(0xa7a9ab);
super.paint(graphics);
}
}
}
提前感谢您的任何建议
【问题讨论】：
-
如果没有看到实际代码，我们无法告诉您代码出了什么问题。请编辑问题以粘贴到重要部分。谢谢。
-
我们可以查看未正确绘制的字段的绘制方法吗？
-
嗨，彼得，我设法找到了问题。但无法将此标记为已回答：/。非常感谢您的努力。
-
@Kevin，我认为接受您自己的答案需要等待一段时间，但如果您发布的答案确实是解决方案，最好接受它，以便以后阅读本文的人受益。所以，我明天再试试。谢谢。
-
同意，我昨天试过了，但有 2 天的等待期。
标签： blackberry scroll redraw