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Code Issues Projects Releases Wiki Activity

Use consistent conditions to decide whether to scroll.

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This commit is contained in:
akwizgran
2019-01-08 13:34:37 +00:00
parent 045fcfc5fa
commit 418451cbd9
2 changed files with 55 additions and 44 deletions
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5
briar-android/src/main/java/org/briarproject/briar/android/conversation/AttachmentController.java
View File

@@ -86,8 +86,7 @@ class AttachmentController {
List<Pair<AttachmentHeader, Attachment>> attachments =
new ArrayList<>(headers.size());
for (AttachmentHeader h : headers) {
Attachment a =
messagingManager.getAttachment(h.getMessageId());
Attachment a = messagingManager.getAttachment(h.getMessageId());
attachments.add(new Pair<>(h, a));
}
logDuration(LOG, "Loading attachment", start);
@@ -96,7 +95,7 @@ class AttachmentController {
/**
* Creates {@link AttachmentItem}s from the passed headers and Attachments.
*
* <p>
* Note: This closes the {@link Attachment}'s {@link InputStream}.
*/
List<AttachmentItem> getAttachmentItems(

94
briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationActivity.java
View File

@@ -103,7 +103,7 @@ import im.delight.android.identicons.IdenticonDrawable;
import uk.co.samuelwall.materialtaptargetprompt.MaterialTapTargetPrompt;
import uk.co.samuelwall.materialtaptargetprompt.MaterialTapTargetPrompt.PromptStateChangeListener;
import static android.arch.lifecycle.Lifecycle.State.RESUMED;
import static android.arch.lifecycle.Lifecycle.State.STARTED;
import static android.os.Build.VERSION.SDK_INT;
import static android.support.v4.app.ActivityOptionsCompat.makeSceneTransitionAnimation;
import static android.support.v4.view.ViewCompat.setTransitionName;
@@ -269,6 +269,12 @@ public class ConversationActivity extends BriarActivity
textInputView.setSendController(sendController);
textInputView.setMaxTextLength(MAX_PRIVATE_MESSAGE_TEXT_LENGTH);
textInputView.setEnabled(false);
textInputView.addOnKeyboardShownListener(this::scrollToBottom);
}
private void scrollToBottom() {
int items = adapter.getItemCount();
if (items > 0) list.scrollToPosition(items - 1);
}
@Override
@@ -408,33 +414,10 @@ public class ConversationActivity extends BriarActivity
Long.compare(b.getTimestamp(), a.getTimestamp()));
if (!sorted.isEmpty()) {
// If the latest header is a private message, eagerly load
// its text so we can set the scroll position correctly
// its size so we can set the scroll position correctly
ConversationMessageHeader latest = sorted.get(0);
if (latest instanceof PrivateMessageHeader) {
MessageId id = latest.getId();
PrivateMessageHeader h = (PrivateMessageHeader) latest;
if (h.hasText()) {
String text = textCache.get(id);
if (text == null) {
LOG.info(
"Eagerly loading text of latest message");
text = messagingManager.getMessageText(id);
textCache.put(id, text);
}
}
if (h.getAttachmentHeaders().size() == 1) {
List<AttachmentItem> items =
attachmentController.get(id);
if (items == null) {
LOG.info(
"Eagerly loading image size for latest message");
items = attachmentController.getAttachmentItems(
attachmentController
.getMessageAttachments(
h.getAttachmentHeaders()));
attachmentController.put(id, items);
}
}
eagerlyLoadMessageSize((PrivateMessageHeader) latest);
}
}
displayMessages(revision, sorted);
@@ -446,6 +429,32 @@ public class ConversationActivity extends BriarActivity
});
}
private void eagerlyLoadMessageSize(PrivateMessageHeader h)
throws DbException {
MessageId id = h.getId();
// If the message has text, load it
if (h.hasText()) {
String text = textCache.get(id);
if (text == null) {
LOG.info("Eagerly loading text for latest message");
text = messagingManager.getMessageText(id);
textCache.put(id, text);
}
}
// If the message has a single image, load its size - for multiple
// images we use a grid so the size is fixed
if (h.getAttachmentHeaders().size() == 1) {
List<AttachmentItem> items = attachmentController.get(id);
if (items == null) {
LOG.info("Eagerly loading image size for latest message");
items = attachmentController.getAttachmentItems(
attachmentController.getMessageAttachments(
h.getAttachmentHeaders()));
attachmentController.put(id, items);
}
}
}
private void displayMessages(int revision,
Collection<ConversationMessageHeader> headers) {
runOnUiThreadUnlessDestroyed(() -> {
@@ -456,9 +465,9 @@ public class ConversationActivity extends BriarActivity
adapter.addAll(items);
list.showData();
if (layoutManagerState == null) {
// Scroll to the bottom
list.scrollToPosition(adapter.getItemCount() - 1);
scrollToBottom();
} else {
// Restore the previous scroll position
layoutManager.onRestoreInstanceState(layoutManagerState);
}
} else {
@@ -501,17 +510,21 @@ public class ConversationActivity extends BriarActivity
Pair<Integer, ConversationMessageItem> pair =
adapter.getMessageItem(m);
if (pair != null) {
boolean scroll = shouldScrollWhenUpdatingMessage();
pair.getSecond().setText(text);
boolean shouldScroll = layoutManagerState == null &&
adapter.isScrolledToBottom(layoutManager);
adapter.notifyItemChanged(pair.getFirst());
if (shouldScroll) {
list.scrollToPosition(adapter.getItemCount() - 1);
}
if (scroll) scrollToBottom();
}
});
}
// When a message's text or attachments are loaded, scroll to the bottom
// if the conversation is visible and we were previously at the bottom
private boolean shouldScrollWhenUpdatingMessage() {
return getLifecycle().getCurrentState().isAtLeast(STARTED)
&& adapter.isScrolledToBottom(layoutManager);
}
private void loadMessageAttachments(MessageId messageId,
List<AttachmentHeader> headers) {
runOnDbThread(() -> {
@@ -535,13 +548,10 @@ public class ConversationActivity extends BriarActivity
Pair<Integer, ConversationMessageItem> pair =
adapter.getMessageItem(m);
if (pair != null) {
boolean scroll = shouldScrollWhenUpdatingMessage();
pair.getSecond().setAttachments(items);
boolean shouldScroll = layoutManagerState == null &&
adapter.isScrolledToBottom(layoutManager);
adapter.notifyItemChanged(pair.getFirst());
if (shouldScroll) {
list.scrollToPosition(adapter.getItemCount() - 1);
}
if (scroll) scrollToBottom();
}
});
}
@@ -590,11 +600,13 @@ public class ConversationActivity extends BriarActivity
private void addConversationItem(ConversationItem item) {
runOnUiThreadUnlessDestroyed(() -> {
// whenever the activity is shown, we'll scroll down for new msgs
boolean shouldScroll = getLifecycle().getCurrentState() == RESUMED;
adapter.incrementRevision();
adapter.add(item);
if (shouldScroll) list.scrollToPosition(adapter.getItemCount() - 1);
// When adding a new message, scroll to the bottom if the
// conversation is visible, even if we're not currently at
// the bottom
if (getLifecycle().getCurrentState().isAtLeast(STARTED))
scrollToBottom();
});
}