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Code Issues Releases Wiki Activity

Remove TextEllipsizer

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This commit is contained in:
Isira Seneviratne 2024-07-25 07:49:01 +05:30
parent 82e5b6b1e9
commit d7de38c79c
1 changed files with 0 additions and 193 deletions
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app/src/main/java/org/schabi/newpipe/util/text/TextEllipsizer.java
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@ -1,193 +0,0 @@
package org.schabi.newpipe.util.text;
import android.graphics.Paint;
import android.text.Layout;
import android.view.View;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.text.HtmlCompat;
import org.schabi.newpipe.extractor.StreamingService;
import org.schabi.newpipe.extractor.stream.Description;
import java.util.function.Consumer;
import io.reactivex.rxjava3.disposables.CompositeDisposable;
/**
* <p>Class to ellipsize text inside a {@link TextView}.</p>
* This class provides all utils to automatically ellipsize and expand a text
*/
public final class TextEllipsizer {
private static final int EXPANDED_LINES = Integer.MAX_VALUE;
private static final String ELLIPSIS = "…";
@NonNull private final CompositeDisposable disposable = new CompositeDisposable();
@NonNull private final TextView view;
private final int maxLines;
@NonNull private Description content;
@Nullable private StreamingService streamingService;
@Nullable private String streamUrl;
private boolean isEllipsized = false;
@Nullable private Boolean canBeEllipsized = null;
@NonNull private final Paint paintAtContentSize = new Paint();
private final float ellipsisWidthPx;
@Nullable private Consumer<Boolean> stateChangeListener = null;
@Nullable private Consumer<Boolean> onContentChanged;
public TextEllipsizer(@NonNull final TextView view,
final int maxLines,
@Nullable final StreamingService streamingService) {
this.view = view;
this.maxLines = maxLines;
this.content = Description.EMPTY_DESCRIPTION;
this.streamingService = streamingService;
paintAtContentSize.setTextSize(view.getTextSize());
ellipsisWidthPx = paintAtContentSize.measureText(ELLIPSIS);
}
public void setOnContentChanged(@Nullable final Consumer<Boolean> onContentChanged) {
this.onContentChanged = onContentChanged;
}
public void setContent(@NonNull final Description content) {
this.content = content;
canBeEllipsized = null;
linkifyContentView(v -> {
final int currentMaxLines = view.getMaxLines();
view.setMaxLines(EXPANDED_LINES);
canBeEllipsized = view.getLineCount() > maxLines;
view.setMaxLines(currentMaxLines);
if (onContentChanged != null) {
onContentChanged.accept(canBeEllipsized);
}
});
}
public void setStreamUrl(@Nullable final String streamUrl) {
this.streamUrl = streamUrl;
}
public void setStreamingService(@NonNull final StreamingService streamingService) {
this.streamingService = streamingService;
}
/**
* Expand the {@link TextEllipsizer#content} to its full length.
*/
public void expand() {
view.setMaxLines(EXPANDED_LINES);
linkifyContentView(v -> isEllipsized = false);
}
/**
* Shorten the {@link TextEllipsizer#content} to the given number of
* {@link TextEllipsizer#maxLines maximum lines} and add trailing '{@code …}'
* if the text was shorted.
*/
public void ellipsize() {
// expand text to see whether it is necessary to ellipsize the text
view.setMaxLines(EXPANDED_LINES);
linkifyContentView(v -> {
final CharSequence charSeqText = view.getText();
if (charSeqText != null && view.getLineCount() > maxLines) {
// Note that converting to String removes spans (i.e. links), but that's something
// we actually want since when the text is ellipsized we want all clicks on the
// comment to expand the comment, not to open links.
final String text = charSeqText.toString();
final Layout layout = view.getLayout();
final float lineWidth = layout.getLineWidth(maxLines - 1);
final float layoutWidth = layout.getWidth();
final int lineStart = layout.getLineStart(maxLines - 1);
final int lineEnd = layout.getLineEnd(maxLines - 1);
// remove characters up until there is enough space for the ellipsis
// (also summing 2 more pixels, just to be sure to avoid float rounding errors)
int end = lineEnd;
float removedCharactersWidth = 0.0f;
while (lineWidth - removedCharactersWidth + ellipsisWidthPx + 2.0f > layoutWidth
&& end >= lineStart) {
end -= 1;
// recalculate each time to account for ligatures or other similar things
removedCharactersWidth = paintAtContentSize.measureText(
text.substring(end, lineEnd));
}
// remove trailing spaces and newlines
while (end > 0 && Character.isWhitespace(text.charAt(end - 1))) {
end -= 1;
}
final String newVal = text.substring(0, end) + ELLIPSIS;
view.setText(newVal);
isEllipsized = true;
} else {
isEllipsized = false;
}
view.setMaxLines(maxLines);
});
}
/**
* Toggle the view between the ellipsized and expanded state.
*/
public void toggle() {
if (isEllipsized) {
expand();
} else {
ellipsize();
}
}
/**
* Whether the {@link #view} can be ellipsized.
* This is only the case when the {@link #content} has more lines
* than allowed via {@link #maxLines}.
* @return {@code true} if the {@link #content} has more lines than allowed via
* {@link #maxLines} and thus can be shortened, {@code false} if the {@code content} fits into
* the {@link #view} without being shortened and {@code null} if the initialization is not
* completed yet.
*/
@Nullable
public Boolean canBeEllipsized() {
return canBeEllipsized;
}
private void linkifyContentView(final Consumer<View> consumer) {
final boolean oldState = isEllipsized;
disposable.clear();
TextLinkifier.fromDescription(view, content,
HtmlCompat.FROM_HTML_MODE_LEGACY, streamingService, streamUrl, disposable,
v -> {
consumer.accept(v);
notifyStateChangeListener(oldState);
});
}
/**
* Add a listener which is called when the given content is changed,
* either from <em>ellipsized</em> to <em>full</em> or vice versa.
* @param listener The listener to be called, or {@code null} to remove it.
* The Boolean parameter is the new state.
* <em>Ellipsized</em> content is represented as {@code true},
* normal or <em>full</em> content by {@code false}.
*/
public void setStateChangeListener(@Nullable final Consumer<Boolean> listener) {
this.stateChangeListener = listener;
}
private void notifyStateChangeListener(final boolean oldState) {
if (oldState != isEllipsized && stateChangeListener != null) {
stateChangeListener.accept(isEllipsized);
}
}
}