黑莓 - 创建自定义日期字段 [英] BlackBerry - Creating custom Date Field
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问题描述
我想创建一个类似如下的领域....任何一个可以告诉我怎么可以这样做我可以使用哪些领域在哪里我可以通过使用轨迹球/轮或风暴的情况下，选择值我可以幻灯片...
i want to create a field that looks like this ....can any one tell me how this could be done which field could i use where in i can select values by using the trackball/wheel or in case of storm i could slide...
推荐答案
这可能是简单的标签或位场延伸，带导航事件处理。
It could be simple Label or Bitmap Field extention, with navigation event handling.
您需要将与将在横向导航循环改变值字符串数组。结果
如果这样的自定义字段的重点，制定和下阵列。
You will need to hold String array with values which will be changed in circle on horizontal navigation.
If such custom Field is focused, draw Up and Down arrays.
因此，将有一个这样的场的DAYOFWEEK，一个用于月，一个用于DAYOFMONTH，一个用于年份
So, there will be one such Field for DayOfWeek, one for Month, one for DayOfMonth, one for Year.
将他们都在HorizontalFieldManager，这将被放置在PopupScreen，在弹出关闭geather所有值和撰写日期值（可在FieldChangeListener传递）
Place them all in HorizontalFieldManager, which will be placed in PopupScreen, on popup close geather all values and compose Date value (may be passed over FieldChangeListener)
更新
在与车轮的方便设备上实现导航点击保存 - 关闭功能，但在风暴这将是一个问题（对话将在每个领域重点操作关闭）。为了解决这个问题，确定和取消按钮添加
On devices with wheel its easy to implement save-and-close functionality on navigation click, but in Storm that would be a problem (dialog will be closed on each field focus action). To solve this, OK and Cancel buttons added.
此外，增加的TouchEvent采用触摸点击来处理适当的值的变化。
Also, touchEvent added to handle proper value change using touch click.
您可以保留不同的实现对于RIM OS＆LT; = 4.6和RIM OS> = 4.7，并取代它们生成任务
You may keep different implementations for RIM OS <= 4.6 and RIM OS >= 4.7, and replace them on build task.
class DatePickerDialog extends PopupScreen implements FieldChangeListener {
DatePickerField mDatePicker;
ButtonField mOKButton;
ButtonField mCancelButton;
public DatePickerDialog(Date date) {
super(new VerticalFieldManager(), PopupScreen.DEFAULT_CLOSE);
add(mDatePicker = new DatePickerField(date));
// comment on RIM OS < 4.7
addButtons();
}
private void addButtons() {
HorizontalFieldManager hfm = new HorizontalFieldManager(FIELD_HCENTER);
add(hfm);
mOKButton = new ButtonField("OK", ButtonField.CONSUME_CLICK);
mOKButton.setChangeListener(this);
hfm.add(mOKButton);
mCancelButton = new ButtonField("Cancel", ButtonField.CONSUME_CLICK);
mCancelButton.setChangeListener(this);
hfm.add(mCancelButton);
}
public void setDate(Date dateValue) {
mDatePicker.setDate(dateValue);
}
public Date getDate() {
return mDatePicker.getDate();
}
public DatePickerDialog() {
this(Calendar.getInstance().getTime());
}
// comment on RIM OS < 4.7
public void fieldChanged(Field field, int context) {
if (mOKButton == field) {
getChangeListener().fieldChanged(this, 0);
close();
} else if (mCancelButton == field) {
close();
}
}
// comment on RIM OS > 4.6
// protected boolean navigationClick(int status, int time) {
// getChangeListener().fieldChanged(this, 0);
// close();
// return super.navigationClick(status, time);
// }
class DatePickerField extends HorizontalFieldManager implements
FieldChangeListener {
private String[] daysOfWeek = new String[] { "Sunday", "Monday",
"Tuesday", "Wednesday", "Thursday", "Friday",
"Saturday" };
private String[] months = new String[] { "Jan", "Feb", "Mar", "Apr",
"May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov",
"Dec" };
private int mDayOfMonth = 10;
private int mMonth = 1;
private int mYear = 2009;
private StrTimeField mDayOfWeekField;
private StrTimeField mMonthField;
private NumTimeField mDayOfMonthField;
private NumTimeField mYearField;
Calendar calendar = Calendar.getInstance();
public DatePickerField(Date date) {
calendar.setTime(date);
mYear = calendar.get(Calendar.YEAR);
// Calendar.JANUARY == 0, so +1 value
mMonth = calendar.get(Calendar.MONTH);
mDayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
// think it's better to disable Day Of Week edit
mDayOfWeekField = new StrTimeField(daysOfWeek, dayOfWeek - 1,
NON_FOCUSABLE);
mDayOfWeekField.setChangeListener(this);
add(mDayOfWeekField);
mMonthField = new StrTimeField(months, mMonth);
mMonthField.setChangeListener(this);
add(mMonthField);
mDayOfMonthField = new NumTimeField(mDayOfMonth, 1, 31);
mDayOfMonthField.setChangeListener(this);
add(mDayOfMonthField);
mYearField = new NumTimeField(mYear, 1900, 2012);
mYearField.setChangeListener(this);
add(mYearField);
}
public void fieldChanged(Field field, int context) {
mDayOfMonth = mDayOfMonthField.getValue();
calendar.set(calendar.DAY_OF_MONTH, mDayOfMonth);
mMonth = mMonthField.getValue();
calendar.set(calendar.MONTH, mMonth);
mYear = mYearField.getValue();
calendar.set(calendar.YEAR, mYear);
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK) - 1;
mDayOfWeekField.setIndex(dayOfWeek);
}
public Date getDate() {
return calendar.getTime();
}
public void setDate(Date date) {
calendar.setTime(date);
mYear = calendar.get(Calendar.YEAR);
mMonth = calendar.get(Calendar.MONTH);
mDayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
mDayOfWeekField.setIndex(dayOfWeek - 1);
mMonthField.setIndex(mMonth);
mDayOfMonthField.setValue(mDayOfMonth);
mYearField.setValue(mYear);
}
abstract class TimeField extends LabelField {
int mWidth = 0;
public TimeField() {
super("", FOCUSABLE);
}
public TimeField(long style) {
super("", style);
}
protected abstract void switchValue(int step);
protected boolean navigationMovement(int dx, int dy,
int status, int time) {
if (Math.abs(dy) > Math.abs(dx)) {
switchValue(-dy);
return true;
} else
return super.navigationMovement(dx, dy, status, time);
}
boolean prepared = false;
protected void onFocus(int direction) {
prepared = false;
super.onFocus(direction);
}
protected void onUnfocus() {
invalidate();
super.onUnfocus();
}
// comment on RIM OS < 4.7
protected boolean touchEvent(TouchEvent msg) {
if (isFocus() && msg.getEvent() == TouchEvent.CLICK) {
if (!prepared) {
prepared = true;
} else {
int y = msg.getY(1);
int cy = getTop() + (getHeight() >> 1);
switchValue((y > cy) ? -1 : 1);
}
}
return false;
}
public int getPreferredWidth() {
return mWidth;
}
public int getPreferredHeight() {
return super.getPreferredHeight() + 24;
}
protected void layout(int width, int height) {
super.layout(width, height);
setExtent(getPreferredWidth(), getPreferredHeight());
}
protected void paint(Graphics graphics) {
String text = getText();
Font font = getFont();
int x = (getPreferredWidth()
- font.getAdvance(text)) >> 1;
int y = (getPreferredHeight() - font.getHeight()) >> 1;
graphics.drawText(text, x, y);
if (isFocus()) {
graphics.setColor(Color.WHITE);
int xc = (getPreferredWidth() >> 1);
int y1 = 10, y2 = 0, x2 = xc - 9, x1 = xc + 9;
int[] xPts = new int[] { x1, x2, xc };
int[] yPts = new int[] { y1, y1, y2 };
graphics.drawFilledPath(xPts, yPts,
null, null);
y2 = getPreferredHeight();
y1 = y2 - 10;
yPts = new int[] { y1, y1, y2 };
graphics.drawFilledPath(xPts, yPts,
null, null);
}
}
public abstract int getValue();
}
class StrTimeField extends TimeField {
String[] mValues;
int mIndex;
public StrTimeField(String[] values) {
this(values, 0);
}
public StrTimeField(String[] values, int value) {
this(values, value, FOCUSABLE);
}
public StrTimeField(String[] values, int value, long style) {
super(style);
mValues = values;
setIndex(value);
Font font = getFont();
for (int i = 0; i < mValues.length; i++) {
int width = font.getAdvance(mValues[i]);
mWidth = Math.max(mWidth, width);
}
mWidth += 10;
}
protected void switchValue(int step) {
int index = mIndex + step;
if (index < 0 || index >= mValues.length)
index += ((index > 0) ? -1 : 1)
* mValues.length;
setIndex(index);
}
private void setIndex(int index) {
if (index >= 0 && index < mValues.length) {
mIndex = index;
setText(mValues[mIndex]);
}
}
public int getValue() {
return mIndex;
}
}
class NumTimeField extends TimeField {
int mValue;
int mMinValue;
int mMaxValue;
public NumTimeField(int val, int minVal, int maxVal) {
this(val, minVal, maxVal, FOCUSABLE);
}
public NumTimeField(int val, int minVal, int maxVal,
long style) {
super(style);
mValue = val;
mMinValue = minVal;
mMaxValue = maxVal;
setText(String.valueOf(mValue));
int maxDig = String.valueOf(mMaxValue).length();
String test = "";
for (int i = 0; i < maxDig; i++)
test += "0";
mWidth = getFont().getAdvance(test);
mWidth += 10;
}
protected void switchValue(int step) {
int value = mValue + step;
if (value > mMaxValue)
value = value - (mMaxValue - mMinValue + 1);
if (value < mMinValue)
value = value + (mMaxValue - mMinValue + 1);
setValue(value);
}
private void setValue(int value) {
mValue = value;
setText(String.valueOf(mValue));
}
public int getValue() {
return mValue;
}
}
}
}
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