/**
* Copy dirty layer references to array for further painting. The copying is needed to not keep
* lock on layers list when layers painting will happen. Dirty states of the layers are cleaned
* after the copying. Layers painting can change layers state again, but it will be served on next
* repaint only.
*/
private void copyAndCleanDirtyLayers() {
if (CGraphicsQ.DEBUG) {
System.err.println("[Copy dirty layers]");
}
CLayer l;
dirtyCount = 0;
int layersCount = layers.size();
// Heuristics to increase array for copied dirty layers
if (layersCount > dirtyMaxCount) {
dirtyMaxCount += layersCount;
dirtyLayers = new CLayer[dirtyMaxCount];
}
// Copy dirty layer references and reset dirty layer states
for (CLayerElement le = layers.getBottom(); le != null; le = le.getUpper()) {
l = le.getLayer();
if (l.visible && l.isDirty()) {
l.copyAndCleanDirtyState();
dirtyLayers[dirtyCount++] = l;
} else { // !(visible && dirty)
if (CGraphicsQ.DEBUG) {
System.err.println("Skip Layer: " + l);
}
} // if
} // for
}
/**
* First Pass: We do sweep and mark of all layers requiring a repaint, the areas behind a visible
* opaque layers need no repaint
*/
private void sweepAndMarkLayers() {
if (CGraphicsQ.DEBUG) {
System.err.println("[Sweep and mark layers]");
}
CLayer l;
CLayerElement changed;
CLayerElement le = layers.getTop();
while (le != null) {
l = le.getLayer();
if (l.visible && l.opaque) {
cleanLowerDirtyRegions(le);
}
// The dirty layer can be invisible, that means it
// has been hidden since the previous paint.
if (l.isDirty()) {
// In the case higher layer was changed we need to
// restart all the algorithm from the changed layer
changed = sweepAndMarkDirtyLayer(le, !l.visible);
if (changed != null) {
if (CGraphicsQ.DEBUG) {
System.err.println("Restart sweep and mark: " + changed.getLayer());
}
le = changed;
changed = null;
continue;
}
}
// Go to next lower layer
le = le.getLower();
}
}
/**
* Add a new CLayer to the "deck" of layers associated with this CWindow. This method will
* sequentially add layers to the window, placing subsequently added layers on top of previously
* added layers.
*
* @param layer the new layer to add to this window
* @return true if new layer was added, false otherwise
*/
public boolean addLayer(CLayer layer) {
if (layer != null) {
if (CGraphicsQ.DEBUG) {
System.err.println("Add Layer: " + layer);
}
synchronized (layers) {
if (layers.find(layer) == null) {
layer.owner = this;
layers.addLayer(layer);
layer.addDirtyRegion();
requestRepaint();
layer.addNotify();
return true;
}
}
}
return false;
}
/**
* Sets all visible layers to dirty state. The method is needed on system events like screen
* rotation, when generic layers system is not capabel to properly analyze layers changes, e.g. of
* move/resize kind. It could be fixed in the future and this method will be out of use.
*/
public void setAllDirty() {
synchronized (layers) {
CLayer l;
for (CLayerElement le = layers.getBottom(); le != null; le = le.getUpper()) {
l = le.getLayer();
if (l.visible) {
l.addDirtyRegion();
} // if
} // for
} // synchronized
}
/**
* Handle input from some type of device-dependent input method. This could be input from
* something such as T9, or a phonebook lookup, etc.
*
* @param str the text to handle as direct input
* @return true if this window or one of its layers processed the event
*/
public boolean methodInput(String str) {
CLayer layer;
synchronized (layers) {
for (CLayerElement le = layers.getTop(); le != null; le = le.getLower()) {
layer = le.getLayer();
if (layer.visible && layer.supportsInput && layer.methodInput(str)) {
return true;
}
}
} // sync
return false;
}
/**
* Allow this window to process key input. The type of key input will be press, release, repeat,
* etc. The key code will identify which key generated the event. This method will return true if
* the event was processed by this window or one of its layers, false otherwise.
*
* @param type the type of key event (press, release, repeat)
* @param keyCode the identifier of the key which generated the event
* @return true if this window or one of its layers processed the event
*/
public boolean keyInput(int type, int keyCode) {
CLayer layer;
synchronized (layers) {
for (CLayerElement le = layers.getTop(); le != null; le = le.getLower()) {
layer = le.getLayer();
if (layer.supportsInput && layer.keyInput(type, keyCode)) {
return true;
}
}
} // sync
return false;
}
/**
* Check whether layer is overlapped with a higher visible layer in the layer stack of the window
*
* @param l layer to check overlapping
* @return true if overlapped, false otherwise
*/
public boolean isOverlapped(CLayer l) {
synchronized (layers) {
CLayerElement le = layers.find(l);
if (le != null) {
CLayer l2;
for (le = le.getUpper(); le != null; le = le.getUpper()) {
l2 = le.getLayer();
if (l2.isVisible() && l.intersects(l2)) {
return true;
}
}
}
}
return false;
}
/**
* Remove a layer from this CWindow. This method will remove the given layer from the "deck" of
* layers associated with this CWindow. If successfull, this method will return true, false
* otherwise (for example, if the layer does not belong to this window).
*
* @param layer the layer to remove from this window
* @return true if successful, false otherwise
*/
public boolean removeLayer(CLayer layer) {
synchronized (layers) {
CLayerElement le = sweepLayer(layer);
if (le != null) {
if (CGraphicsQ.DEBUG) {
System.err.println("Remove Layer: " + layer);
}
layer.owner = null;
requestRepaint();
layers.removeLayerElement(le);
layer.removeNotify(this);
return true;
}
}
return false;
}
/**
* Allow this window to process pointer input. The type of pointer input will be press, release,
* drag, etc. The x and y coordinates will identify the point at which the pointer event occurred
* in the coordinate system of this window. This window will translate the coordinates
* appropriately for each layer contained in this window. This method will return true if the
* event was processed by this window or one of its layers, false otherwise.
*
* @param type the type of pointer event (press, release, drag)
* @param x the x coordinate of the location of the event
* @param y the y coordinate of the location of the event
* @return true if this window or one of its layers processed the event
*/
public boolean pointerInput(int type, int x, int y) {
CLayer layer;
synchronized (layers) {
for (CLayerElement le = layers.getTop(); le != null; le = le.getLower()) {
layer = le.getLayer();
if (layer.visible && layer.supportsInput && layer.handlePoint(x, y)) {
// If the layer is visible, supports input, and
// contains the point of the pointer press, we translate
// the point into the layer's coordinate space and
// pass on the input
if (layer.pointerInput(type, x - layer.bounds[X], y - layer.bounds[Y])) {
return true;
}
}
}
} // sync
return false;
}
/**
* Update dirty regions of all visible layers in the stack regarding the entire area of the given
* layer as being dirty. The method is needed to perform layer move/resize/remove opertion, since
* other layers should be informed of changed area.
*
* @param layer the layer whose area should be reported as dirty to other stack layers
* @return element of the window layers list that contains swept layer, it can be used for further
* layer processing
*/
CLayerElement sweepLayer(CLayer layer) {
if (layer != null) {
if (CGraphicsQ.DEBUG) {
System.err.println("Sweep Layer: " + layer);
}
synchronized (layers) {
CLayerElement le = layers.find(layer);
if (le != null) {
// IMPL NOTE: when a layer gets removed (or has its setVisible(false))
// called, the parent window must loop through all the other
// layers and mark them as dirty if they intersect with the
// layer being removed (or having its visibility changed).
layer.addDirtyRegion();
sweepAndMarkDirtyLayer(le, true);
return le;
}
}
}
return null;
}
