private WVirtualImage.Rect neighbourhood(long x, long y, int marginX, int marginY) {
long x1 = x - marginX;
if (this.imageWidth_ != Infinite) {
x1 = Math.max((long) 0, x1);
}
long y1 = Math.max((long) 0, y - marginY);
long x2 = x + this.viewPortWidth_ + marginX;
if (this.imageWidth_ != Infinite) {
x2 = Math.min(this.imageWidth_, x2);
}
long y2 = Math.min(this.imageHeight_, y + this.viewPortHeight_ + marginY);
return new WVirtualImage.Rect(x1, y1, x2, y2);
}
private void internalScrollTo(long newX, long newY, boolean moveViewPort) {
if (this.imageWidth_ != Infinite) {
newX = Math.min(this.imageWidth_ - this.viewPortWidth_, Math.max((long) 0, newX));
}
if (this.imageHeight_ != Infinite) {
newY = Math.min(this.imageHeight_ - this.viewPortHeight_, Math.max((long) 0, newY));
}
if (moveViewPort) {
this.contents_.setOffsets(new WLength((double) -newX), EnumSet.of(Side.Left));
this.contents_.setOffsets(new WLength((double) -newY), EnumSet.of(Side.Top));
}
this.generateGridItems(newX, newY);
this.viewPortChanged_.trigger(this.currentX_, this.currentY_);
}
private void generateGridItems(long newX, long newY) {
WVirtualImage.Rect newNb =
this.neighbourhood(newX, newY, this.viewPortWidth_, this.viewPortHeight_);
long i1 = newNb.x1 / this.gridImageSize_;
long j1 = newNb.y1 / this.gridImageSize_;
long i2 = newNb.x2 / this.gridImageSize_ + 1;
long j2 = newNb.y2 / this.gridImageSize_ + 1;
for (int invisible = 0; invisible < 2; ++invisible) {
for (long i = i1; i < i2; ++i) {
for (long j = j1; j < j2; ++j) {
long key = this.gridKey(i, j);
WImage it = this.grid_.get(key);
if (it == null) {
boolean v = this.visible(i, j);
if (v && !(invisible != 0) || !v && invisible != 0) {
long brx = i * this.gridImageSize_ + this.gridImageSize_;
long bry = j * this.gridImageSize_ + this.gridImageSize_;
brx = Math.min(brx, this.imageWidth_);
bry = Math.min(bry, this.imageHeight_);
WImage img =
this.createImage(
i * this.gridImageSize_,
j * this.gridImageSize_,
(int) (brx - i * this.gridImageSize_),
(int) (bry - j * this.gridImageSize_));
img.setAttributeValue("onmousedown", "return false;");
this.contents_.addWidget(img);
img.setPositionScheme(PositionScheme.Absolute);
img.setOffsets(new WLength((double) i * this.gridImageSize_), EnumSet.of(Side.Left));
img.setOffsets(new WLength((double) j * this.gridImageSize_), EnumSet.of(Side.Top));
this.grid_.put(key, img);
}
}
}
}
}
this.currentX_ = newX;
this.currentY_ = newY;
this.cleanGrid();
}
