/*
*
*
* Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package javax.microedition.lcdui;
import com.sun.midp.log.Logging;
import com.sun.midp.log.LogChannels;
import com.sun.midp.chameleon.layers.ScrollBarLayer;
import com.sun.midp.chameleon.skins.ScreenSkin;
/**
* This is the look &s; feel implementation for Screen.
*/
class ScreenLFImpl extends DisplayableLFImpl {
// ************************************************************
// public methods
// ************************************************************
/**
* Override DisplayableLFImpl.lCallHide() to set local variables.
*/
void lCallHide() {
// NOTE that resetToTop is also set to false
// Display.setCurrentItem() is called.
// Because of that just knowing current state of DisplayLF
// is not enough to set it properly in lCallShow.
// That is why it has to be updated in lCallHide and lCallFreeze
super.lCallHide();
}
/**
* Override DisplayableLFImpl.lCallFreeze() to set local variables.
*/
void lCallFreeze() {
if (state == SHOWN) {
resetToTop = false;
}
super.lCallFreeze();
}
// ************************************************************
// package private methods
// ************************************************************
/**
* Creates ScreenLF for the passed in screen.
* @param screen the Screen object associated with this look&feel
*/
ScreenLFImpl(Screen screen) {
super(screen);
viewable = new int[4];
viewable[X] = 0;
viewable[Y] = 0;
viewable[WIDTH] = 0;
viewable[HEIGHT] = 0;
}
/**
* Paint the contents of this Screen
*
* @param g the Graphics to paint to
* @param target the target Object of this repaint
*/
public void uCallPaint(Graphics g, Object target) {
if (Logging.REPORT_LEVEL <= Logging.INFORMATION) {
Logging.report(Logging.INFORMATION, LogChannels.LC_HIGHUI,
"Screen:Clip: " +
g.getClipX() + "," + g.getClipY() + "," +
g.getClipWidth() + "," + g.getClipHeight());
}
}
/**
* Set the vertical scroll position and proportion
*
* @param scrollPosition The vertical scroll position to set on a
* scale of 0-100
* @param scrollProportion The vertical scroll proportion to set on
* a scale of 0-100. For example, if the viewport
* is 25 pixels high and the Displayable is 100
* pixels high, then the scroll proportion would
* be 25, since only 25% of the Displayable can
* be viewed at any one time. This proportion
* value can be used by implementations which
* render scrollbars to indicate scrollability
* to the user.
*/
boolean setVerticalScroll(int scrollPosition, int scrollProportion) {
this.vScrollPosition = scrollPosition;
this.vScrollProportion = scrollProportion;
if (lIsShown()) {
return currentDisplay.setVerticalScroll(scrollPosition, scrollProportion);
}
return false;
}
/**
* Get the current vertical scroll position
*
* @return int The vertical scroll position on a scale of 0-100
*/
public int getVerticalScrollPosition() {
// SYNC NOTE: return of atomic value
return vScrollPosition;
}
/**
* Get the current vertical scroll proportion
*
* @return ing The vertical scroll proportion on a scale of 0-100
*/
public int getVerticalScrollProportion() {
// SYNC NOTE: return of atomic value
return vScrollProportion;
}
/**
* Set the vertical scroll indicators for this Screen
*/
void setVerticalScroll() {
if (viewable[HEIGHT] <= viewport[HEIGHT]) {
setVerticalScroll(0, 100);
} else {
setVerticalScroll((viewable[Y] * 100 /
(viewable[HEIGHT] - viewport[HEIGHT])),
(viewport[HEIGHT] * 100 / viewable[HEIGHT]));
}
}
/**
* Paint an Item contained in this Screen. The Item requests a paint
* in its own coordinate space. Screen translates those coordinates
* into the overall coordinate space and schedules the repaint
*
* @param item the Item requesting the repaint
* @param x the x-coordinate of the origin of the dirty region
* @param y the y-coordinate of the origin of the dirty region
* @param w the width of the dirty region
* @param h the height of the dirty region
*/
void lRequestPaintItem(Item item, int x, int y, int w, int h) {
ItemLFImpl iLF = (ItemLFImpl)item.getLF();
lRequestPaint(iLF.bounds[X] - viewable[X] + x,
iLF.bounds[Y] - viewable[Y] + y,
w, h);
}
/**
* Perform a page flip in the given direction. This method will
* attempt to scroll the view to show as much of the next page
* as possible.
*
* @param dir the direction of the flip, either DOWN or UP
*/
protected void uScrollViewport(int dir) {
int newY = viewable[Y];
switch (dir) {
case Canvas.UP:
newY -= lGetHeight() - getScrollAmount();
if (newY < 0) {
newY = 0;
}
break;
case Canvas.DOWN:
newY += lGetHeight() - getScrollAmount();
int max = getMaxScroll();
if (newY > max) {
newY = max;
}
break;
default:
break;
}
viewable[Y] = newY;
}
/**
* Perform a line scrolling in the given direction. This method will
* attempt to scroll the view to show next/previous line.
*
* @param dir the direction of the flip, either DOWN or UP
*/
protected void uScrollByLine(int dir) {
int newY = viewable[Y];
if (dir == Canvas.UP) {
newY -= getScrollAmount();
if (newY < 0) {
newY = 0;
}
} else if (dir == Canvas.DOWN) {
newY += getScrollAmount();
int max = getMaxScroll();
if (newY > max) {
newY = max;
}
}
viewable[Y] = newY;
}
/**
* Perform a scrolling at the given position.
* @param context position
*/
protected void uScrollAt(int position) {
int max = getMaxScroll();
int newY = max * position / 100 ;
if (newY < 0) {
newY = 0;
} else if (newY > max) {
newY = max;
}
viewable[Y] = newY;
}
/**
* The maximum amount of scroll needed to see all the contents
* @return get the maximum scroll amount
*/
protected int getMaxScroll() {
return viewable[HEIGHT] - viewport[HEIGHT];
}
/**
* This is the number of pixels left from the previous "page"
* when a page up or down occurs. The same value is used for line by
* line scrolling
* @return the number of pixels.
*/
protected int getScrollAmount() {
return ScreenSkin.SCROLL_AMOUNT;
}
/**
* Scroll content inside of the form.
* @param scrollType scrollType. Scroll type can be one of the following
* @see ScrollBarLayer.SCROLL_NONE
* @see ScrollBarLayer.SCROLL_PAGEUP
* @see ScrollBarLayer.SCROLL_PAGEDOWN
* @see ScrollBarLayer.SCROLL_LINEUP
* @see ScrollBarLayer.SCROLL_LINEDOWN or
* @see ScrollBarLayer.SCROLL_THUMBTRACK
* @param thumbPosition
*/
public void uCallScrollContent(int scrollType, int thumbPosition) {
if (Logging.REPORT_LEVEL <= Logging.INFORMATION) {
Logging.report(Logging.INFORMATION,
LogChannels.LC_HIGHUI,
"Screen.uCallScrollContent scrollType=" + scrollType +
" thumbPosition=" + thumbPosition);
}
int oldY = viewable[Y];
switch (scrollType) {
case ScrollBarLayer.SCROLL_PAGEUP:
uScrollViewport(Canvas.UP);
break;
case ScrollBarLayer.SCROLL_PAGEDOWN:
uScrollViewport(Canvas.DOWN);
break;
case ScrollBarLayer.SCROLL_LINEUP:
uScrollByLine(Canvas.UP);
break;
case ScrollBarLayer.SCROLL_LINEDOWN:
uScrollByLine(Canvas.DOWN);
break;
case ScrollBarLayer.SCROLL_THUMBTRACK:
uScrollAt(thumbPosition);
break;
default:
break;
}
if (oldY != viewable[Y]) {
uRequestPaint();
setupScroll();
}
}
/**
* all scroll actions should be handled through here.
*
*/
void setupScroll() {
if (Logging.REPORT_LEVEL <= Logging.INFORMATION) {
Logging.report(Logging.INFORMATION,
LogChannels.LC_HIGHUI_FORM_LAYOUT,
"[F] >> in FormLFImpl - setupScroll " +
invalidScroll +
"[F] >> viewable[Y] == "+viewable[Y] +
" lastScrollPosition] == "+lastScrollPosition +
"[F] >> viewable[HEIGHT] == "+viewable[HEIGHT] +
" lastScrollSize == "+lastScrollSize);
}
// check if scroll moves, and if so, refresh scrollbars
if (!invalidScroll &&
(viewable[Y] != lastScrollPosition ||
(lastScrollSize != 0 &&
viewable[HEIGHT] + viewport[HEIGHT] != lastScrollSize))) {
lastScrollPosition = viewable[Y];
lastScrollSize = viewport[HEIGHT] >= viewable[HEIGHT] ?
0: viewable[HEIGHT] + viewport[HEIGHT];
invalidScroll = true;
// IMPL_NOTE: mark Items for repaint. -au
}
if (invalidScroll) {
if (Logging.REPORT_LEVEL <= Logging.INFORMATION) {
Logging.report(Logging.INFORMATION,
LogChannels.LC_HIGHUI_FORM_LAYOUT,
"[F] ## invalidScroll ");
}
// draw the scrollbars
setVerticalScroll();
invalidScroll = false;
}
}
// **************************************************************
// ************************************************************
// public member variables - NOT ALLOWED in this class
// ************************************************************
// ************************************************************
// protected member variables - NOT ALLOWED in this class
// ************************************************************
// ************************************************************
// package private member variables
// ************************************************************
/**
* An array which holds the scroll location and
* the overall dimensions of the view being
* shown in the parent Displayable's viewport
* Note that the following is always true.
* 0 <= viewable[X] <= viewable[WIDTH] - viewport[WIDTH]
* 0 <= viewable[Y] <= viewable[HEIGHT] - viewport[HEIGHT]
*/
int viewable[];
/**
* Screens should automatically reset to the top of the when
* they are shown, except in cases where it is interrupted by
* a system menu or an off-screen editor - in which case it
* should be reshown exactly as it was.
*/
boolean resetToTop = true;
// ************************************************************
// private member variables
// ************************************************************
/** The vertical scroll position */
private int vScrollPosition = 0;
/** The vertical scroll proportion */
private int vScrollProportion = 100;
/**
* Used in setupScroll in order to determine if scroll is needed
*/
private int lastScrollPosition = -1;
/**
* Used in setupScroll in order to determine if scroll is needed.
* The value has no meaning for the actual scroll size
*/
private int lastScrollSize = -1;
// ************************************************************
// Static initializer, constructor
// ************************************************************
}
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