/**
* Creates a new {@link StateListDrawable} by looking into the contexts and generating one
* according to their states.
*
* @param adapter
* @param ruleSets
* @param contexts
* @return A new {@link StateListDrawable}. <code>null</code> in case the contexts is <code>null
* </code> or empty.
*/
public static StateListDrawable createNewStateListDrawable(
PXStyleAdapter adapter, List<PXRuleSet> ruleSets, List<PXStylerContext> contexts) {
if (contexts != null && !contexts.isEmpty()) {
// No state-lists here, so simply loop and set the backgrounds
StateListDrawable stateListDrawable =
adapter.shouldAdjustDrawableBounds()
? (new StateListDrawableWithBoundsChange())
: (new StateListDrawable());
int[][] deferredDefaultStates = null;
Drawable defaultDrawable = null;
int rulesetSize = ruleSets.size();
for (int i = 0; i < rulesetSize; i++) {
PXStylerContext context = contexts.get(i);
String activeStateName = context.getActiveStateName();
if (activeStateName == null) {
activeStateName = PXStyleInfo.DEFAULT_STYLE;
}
Drawable drawable =
(context.usesImage() || context.usesColorOnly()) ? context.getBackgroundImage() : null;
// Artificially add states to the one we got. For example, add a
// 'pressed' state to a 'checked' state.
int stateValue = PXDrawableUtil.getStateValue(activeStateName);
if (stateValue == android.R.attr.drawable) {
deferredDefaultStates = adapter.createAdditionalDrawableStates(stateValue);
defaultDrawable = drawable;
} else {
int[][] activeStates = adapter.createAdditionalDrawableStates(stateValue);
for (int[] activeState : activeStates) {
stateListDrawable.addState(activeState, drawable);
}
}
}
if (deferredDefaultStates != null && defaultDrawable != null) {
// add the defaults at the end of the state list.
for (int[] activeState : deferredDefaultStates) {
stateListDrawable.addState(activeState, defaultDrawable);
}
}
return stateListDrawable;
}
return null;
}
/**
* A utility method that will create a new {@link StateListDrawable} from the given contexts and
* the existing {@link View}'s background that is in that context.
*
* @param adapter A {@link PXStyleAdapter}. This will be used to create additional states (see
* {@link PXStyleAdapter#createAdditionalDrawableStates(int)}
* @param existingStates The states that exist in the {@link View} that is being styled. Note that
* in case that the existing states are empty (or <code>null</code>), there may be a need to
* call the {@link #createNewStateListDrawable(PXStyleAdapter, List, List)} method instead.
* @param ruleSets
* @param contexts
* @return A new {@link StateListDrawable}
* @see #createNewStateListDrawable(PXStyleAdapter, List, List)
*/
public static Drawable createDrawable(
PXStyleAdapter adapter,
Map<int[], Drawable> existingStates,
List<PXRuleSet> ruleSets,
List<PXStylerContext> contexts) {
PXStylerContext context = contexts.get(0);
Set<int[]> statesKeys;
if (existingStates != null) {
statesKeys = existingStates.keySet();
} else {
statesKeys = Collections.emptySet();
}
// Will hold the new background.
StateListDrawable stateListDrawable =
adapter.shouldAdjustDrawableBounds()
? (new StateListDrawableWithBoundsChange())
: (new StateListDrawable());
// For every image we have in the contexts, create a drawable and insert
// it into the StateListDrawable. The assumption is that every context
// will provide a drawable for a different state. Otherwise, we may end
// up with multiple drawables for the same state and Android will pick
// the first one it hits. We also want to keep the order of the original
// state list, so we do that insertion in two parts. First, we collect
// all the states indexes that will be 'replaced', and then we do the
// actual construction of the new state-list while weaving in drawables
// from the original list and our contexts.
Map<Integer, Drawable> newStatesPositions = new LinkedHashMap<Integer, Drawable>();
int rulesetSize = ruleSets.size();
for (int i = 0; i < rulesetSize; i++) {
context = contexts.get(i);
Drawable drawable =
(context.usesImage() || context.usesColorOnly()) ? context.getBackgroundImage() : null;
if (drawable != null && existingStates != null && !existingStates.isEmpty()) {
String activeStateName = context.getActiveStateName();
if (activeStateName == null) {
activeStateName = PXStyleInfo.DEFAULT_STYLE;
}
// Artificially add states to the one we got. For example, add a
// 'pressed' state to a 'checked' state.
int[][] activeStates =
adapter.createAdditionalDrawableStates(PXDrawableUtil.getStateValue(activeStateName));
// Find the index we would like to insert this state. Remember
// it and its newly assigned drawable.
int index = 0;
for (int[] state : statesKeys) {
for (int[] activeState : activeStates) {
if (Arrays.equals(state, activeState)) {
// we set the new position, intentionally not
// breaking out of the loop (last occurrence wins)
newStatesPositions.put(index, drawable);
}
}
index++;
}
}
}
// At this point we have the indexes in the original state list that we
// would like to replace with our drawables, so we loop and create a the
// new state list.
int index = 0;
for (int[] state : statesKeys) {
Drawable drawable = newStatesPositions.get(index);
if (drawable != null) {
// NOTE: This is super important for Spinners and
// CheckedTextViews! Update the state list drawable bounds size.
if (adapter.shouldAdjustDrawableBounds()) {
stateListDrawable.getBounds().union(drawable.getBounds());
}
stateListDrawable.addState(state, drawable);
} else {
// add the existing one.
stateListDrawable.addState(state, existingStates.get(state));
}
index++;
}
return stateListDrawable.mutate();
}