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完成自定义栏目优化 https://gitlab.ghzs.com/pm/halo-app-issues/-/issues/891

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This commit is contained in:
chenjuntao
2020-06-12 11:54:04 +08:00
parent a6704e46a9
commit fab1851436
6 changed files with 55 additions and 36 deletions
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47
app/src/main/java/com/gh/common/view/ExpandTextView.java
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@ -25,7 +25,7 @@ public class ExpandTextView extends AppCompatTextView {
private String mEndText = "...";
private String mExpandText = mEndText + "全文";
private boolean mUseGradientAlphaEndText = false;
private boolean mShrinkOnAnchor = false;
private boolean mShrinkOnAnchor = false; // 以锚点所在的位置进行收起 (即 maxLines = 锚点所在的行)
private int mMaxLines = 3; // 由于sdk版本限制(getMaxLines) 这里设置默认值
@ -33,6 +33,7 @@ public class ExpandTextView extends AppCompatTextView {
private boolean mIsExpanded = false; // 位于 recyclerView 时需要自行在外层管理是否已展开
private ExpandCallback mExpandCallback;
private SelfCalculateMaxLinesCallback mMaxLinesCalculatedCallback;
private Rect mLastVisibleLineRect;
private Rect mLastActualLineRect;
@ -65,25 +66,23 @@ public class ExpandTextView extends AppCompatTextView {
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (mShrinkOnAnchor) {
if (mShrinkOnAnchor && getText().toString().contains(SHRINK_ANCHOR)) {
updateMaxLinesByShrinkAnchor();
}
setMeasuredDimension(getMeasuredWidth(), getMeasuredHeight() - getExtraBottomPadding());
}
private void updateMaxLinesByShrinkAnchor() {
int count = getLineCount();
for (int line = 0; line < count; line++) {
int start = getLayout().getLineStart(line);
int end = getLayout().getLineEnd(line);
CharSequence substring = getText().subSequence(start, end);
int lineCount = getLineCount();
for (int line = 0; line < lineCount; line++) {
CharSequence substring = getText().subSequence(getLayout().getLineStart(line), getLayout().getLineEnd(line));
if (substring.toString().contains(SHRINK_ANCHOR)) {
if (mMaxLines != line + 1) {
setExpandMaxLines(line + 1);
int anchorIndex = getText().toString().indexOf(SHRINK_ANCHOR);
SpannableStringBuilder sb = new SpannableStringBuilder(getText());
sb.delete(anchorIndex, anchorIndex + 1);
setText(sb);
if (!mIsExpanded) {
setExpandMaxLines(line + 1);
mMaxLinesCalculatedCallback.onMaxLinesCalculated(line + 1);
}
setText(findAndDeleteAnchor(getText()));
break;
}
}
@ -94,13 +93,13 @@ public class ExpandTextView extends AppCompatTextView {
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
if (mInitLayout && !mIsExpanded && getLineCount() > mMaxLines) {
mSnapshotText = getText();
mSnapshotText = findAndDeleteAnchor(getText());
mInitLayout = false;
showExpandButton();
}
}
public void setExpendText(String text) {
public void setExpandText(String text) {
this.mExpandText = text;
}
@ -241,6 +240,18 @@ public class ExpandTextView extends AppCompatTextView {
return result;
}
// 去掉锚点
private CharSequence findAndDeleteAnchor(CharSequence charSequence) {
int anchorIndex = charSequence.toString().indexOf(SHRINK_ANCHOR);
if (anchorIndex >= 0) {
SpannableStringBuilder sb = new SpannableStringBuilder(getText());
sb.delete(anchorIndex, anchorIndex + 1);
return sb;
} else {
return charSequence;
}
}
/**
* 此方法仅更改标记，不做实际展开的操作
*/
@ -253,8 +264,16 @@ public class ExpandTextView extends AppCompatTextView {
setMaxLines(maxLines);
}
public void setSelfCalculateMaxLinesCallback(SelfCalculateMaxLinesCallback callback) {
mMaxLinesCalculatedCallback = callback;
}
public interface ExpandCallback {
void onExpand();
}
public interface SelfCalculateMaxLinesCallback {
void onMaxLinesCalculated(int maxLines);
}
}