Improve UI

Do screen updates on the next frame, animate resizing in sync with keyboard, remove status bar, transparent background for the terminal

app/Base.lproj/Main.storyboard

@@ -23,7 +23,7 @@
                                 <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                             </view>
                         </subviews>
-                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                         <gestureRecognizers/>
                         <constraints>
                             <constraint firstAttribute="trailing" secondItem="FQi-r8-odu" secondAttribute="trailing" id="EeQ-tO-BY6"/>

app/DelayedUITask.h

@@ -0,0 +1,15 @@
+//
+//  DelayedUITask.h
+//  iSH
+//
+//  Created by Theodore Dubois on 11/8/17.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface DelayedUITask : NSObject
+
+- (instancetype)initWithTarget:(id)target action:(SEL)action;
+- (void)schedule;
+
+@end

app/DelayedUITask.m

@@ -0,0 +1,35 @@
+//
+//  DelayedUITask.m
+//  iSH
+//
+//  Created by Theodore Dubois on 11/8/17.
+//
+
+#import "DelayedUITask.h"
+
+@interface DelayedUITask ()
+
+@property id target;
+@property SEL action;
+@property NSTimer *timer;
+
+@end
+
+@implementation DelayedUITask
+
+- (instancetype)initWithTarget:(id)target action:(SEL)action {
+    if (self = [super init]) {
+        self.target = target;
+        self.action = action;
+    }
+    return self;
+}
+
+- (void)schedule {
+    if (!self.timer.valid) {
+        self.timer = [NSTimer timerWithTimeInterval:1.0/60 target:self.target selector:self.action userInfo:nil repeats:NO];
+        [NSRunLoop.mainRunLoop addTimer:self.timer forMode:NSDefaultRunLoopMode];
+    }
+}
+
+@end

app/Info.plist

@@ -28,6 +28,8 @@
 	<array>
 		<string>armv7</string>
 	</array>
+	<key>UIStatusBarHidden</key>
+	<true/>
 	<key>UISupportedInterfaceOrientations</key>
 	<array>
 		<string>UIInterfaceOrientationPortrait</string>

app/Terminal.m

@@ -6,6 +6,7 @@
 //
 
 #import "Terminal.h"
+#import "DelayedUITask.h"
 #include "fs/tty.h"
 
 @interface Terminal () <WKScriptMessageHandler>
@@ -14,6 +15,9 @@
 @property struct tty *tty;
 @property NSMutableData *pendingData;
 
+@property DelayedUITask *refreshTask;
+@property DelayedUITask *scrollToBottomTask;
+
 @end
 
 @implementation Terminal
@@ -25,6 +29,9 @@ static Terminal *terminal = nil;
         return terminal;
     if (self = [super init]) {
         self.pendingData = [NSMutableData new];
+        self.refreshTask = [[DelayedUITask alloc] initWithTarget:self action:@selector(refresh)];
+        self.scrollToBottomTask = [[DelayedUITask alloc] initWithTarget:self action:@selector(scrollToBottom)];
+        
         WKWebViewConfiguration *config = [WKWebViewConfiguration new];
         [config.userContentController addScriptMessageHandler:self name:@"log"];
         self.webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:config];
@@ -45,36 +52,40 @@ static Terminal *terminal = nil;
 - (size_t)write:(const void *)buf length:(size_t)len {
     @synchronized (self) {
         [self.pendingData appendData:[NSData dataWithBytes:buf length:len]];
-        [self performSelectorOnMainThread:@selector(sendPendingOutput) withObject:nil waitUntilDone:NO];
+        [self.refreshTask schedule];
     }
     return len;
 }
 
 - (void)sendInput:(const char *)buf length:(size_t)len {
     tty_input(self.tty, buf, len);
+    [self.scrollToBottomTask schedule];
+}
+
+- (void)scrollToBottom {
+    [self.webView evaluateJavaScript:@"term.scrollToBottom()" completionHandler:nil];
 }
 
 - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context {
     if (object == self.webView && [keyPath isEqualToString:@"loading"] && !self.webView.loading) {
-        [self sendPendingOutput];
+        [self.refreshTask schedule];
         [self.webView removeObserver:self forKeyPath:@"loading"];
     }
 }
 
-- (void)sendPendingOutput {
+- (void)refresh {
+    if (self.webView.loading)
+        return;
+    
     NSString *str;
     @synchronized (self) {
-        if (self.webView.loading)
-            return;
-        if (self.pendingData.length == 0)
-            return;
         str = [[NSString alloc] initWithData:self.pendingData encoding:NSUTF8StringEncoding];
         self.pendingData = [NSMutableData new];
     }
-    NSError *err;
+    
+    NSError *err = nil;
     NSData *jsonData = [NSJSONSerialization dataWithJSONObject:@[str] options:0 error:&err];
-    if (err != nil)
-        NSLog(@"%@", err);
+    NSAssert(err == nil, @"JSON serialization failed, wtf");
     NSString *jsToEvaluate = [NSString stringWithFormat:@"term.write(%@[0])", [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding]];
     [self.webView evaluateJavaScript:jsToEvaluate completionHandler:nil];
 }

app/TerminalView.m

@@ -21,6 +21,8 @@
     WKWebView *webView = terminal.webView;
     [webView.configuration.userContentController addScriptMessageHandler:self name:@"focus"];
     webView.frame = self.frame;
+    self.opaque = webView.opaque = NO;
+    webView.backgroundColor = UIColor.clearColor;
     [self addSubview:webView];
     webView.translatesAutoresizingMaskIntoConstraints = NO;
     [webView.topAnchor constraintEqualToAnchor:self.topAnchor].active = YES;

app/TerminalViewController.m

@@ -29,7 +29,7 @@
     NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
     [center addObserver:self
                selector:@selector(keyboardDidSomething:)
-                   name:UIKeyboardDidShowNotification
+                   name:UIKeyboardWillShowNotification
                  object:nil];
     [center addObserver:self
                selector:@selector(keyboardDidSomething:)
@@ -42,11 +42,33 @@
                  object:nil];
 }
 
+- (BOOL)prefersStatusBarHidden {
+    return YES;
+}
+
 - (void)keyboardDidSomething:(NSNotification *)notification {
-    NSValue *frame = notification.userInfo[UIKeyboardFrameEndUserInfoKey];
-    self.bottomConstraint.constant = -frame.CGRectValue.size.height;
-    NSLog(@"bottom constant = %f", self.bottomConstraint.constant);
-    [self.termView setNeedsUpdateConstraints];
+    if (self.termView.needsUpdateConstraints) {
+        // initial layout hasn't happened yet, so animation is going to look really bad
+        return;
+    }
+    
+    CGFloat pad = 0;
+    if ([notification.name isEqualToString:UIKeyboardWillShowNotification]) {
+        NSValue *frame = notification.userInfo[UIKeyboardFrameEndUserInfoKey];
+        pad = frame.CGRectValue.size.height;
+    }
+    NSLog(@"pad = %f", pad);
+    self.bottomConstraint.constant = -pad;
+    [self.view setNeedsUpdateConstraints];
+    NSNumber *interval = notification.userInfo[UIKeyboardAnimationDurationUserInfoKey];
+    NSNumber *curve = notification.userInfo[UIKeyboardAnimationCurveUserInfoKey];
+    [UIView animateWithDuration:interval.doubleValue
+                          delay:0
+                        options:curve.integerValue << 16
+                     animations:^{
+                         [self.view layoutIfNeeded];
+    }
+                     completion:nil];
 }
 
 - (void)ishExited:(NSNotification *)notification {

xtermjs/term.css

@@ -5,6 +5,10 @@ html, body, #terminal {
     margin: 0;
 }
 
+body {
+    background: transparent;
+}
+
 #terminal {
     padding: 0 5px;
 }