Filter consecutive newlines

Author: Isaac

submodules/TelegramUI/Components/Chat/ChatTextInputPanelNode/Sources/ChatTextInputPanelComponent.swift

@@ -182,6 +182,7 @@ public final class ChatTextInputPanelComponent: Component {
     let insets: UIEdgeInsets
     let maxHeight: CGFloat
     let maxLength: Int?
+    let allowConsecutiveNewlines: Bool
     let sendAction: (() -> Void)?
     let sendContextAction: ((UIView, ContextGesture) -> Void)?
 
@@ -206,6 +207,7 @@ public final class ChatTextInputPanelComponent: Component {
         insets: UIEdgeInsets,
         maxHeight: CGFloat,
         maxLength: Int?,
+        allowConsecutiveNewlines: Bool,
         sendAction: (() -> Void)?,
         sendContextAction: ((UIView, ContextGesture) -> Void)?
     ) {
@@ -229,6 +231,7 @@ public final class ChatTextInputPanelComponent: Component {
         self.insets = insets
         self.maxHeight = maxHeight
         self.maxLength = maxLength
+        self.allowConsecutiveNewlines = allowConsecutiveNewlines
         self.sendAction = sendAction
         self.sendContextAction = sendContextAction
     }
@@ -294,6 +297,9 @@ public final class ChatTextInputPanelComponent: Component {
         if lhs.maxLength != rhs.maxLength {
             return false
         }
+        if lhs.allowConsecutiveNewlines != rhs.allowConsecutiveNewlines {
+            return false
+        }
         if (lhs.sendAction == nil) != (rhs.sendAction == nil) {
             return false
         }
@@ -1013,6 +1019,8 @@ public final class ChatTextInputPanelComponent: Component {
                 }
             }
 
+            panelNode.allowConsecutiveNewlines = component.allowConsecutiveNewlines
+            
             if let resetInputState = component.externalState.resetInputState {
                 component.externalState.resetInputState = nil
                 let _ = resetInputState

submodules/TelegramUI/Components/Chat/ChatTextInputPanelNode/Sources/ChatTextInputPanelNode.swift

@@ -407,6 +407,7 @@ public class ChatTextInputPanelNode: ChatInputPanelNode, ASEditableTextNodeDeleg
     public var customSendIsDisabled: Bool = false
     public var customInputTextMaxLength: Int?
     public var customSwitchToKeyboard: (() -> Void)?
+    public var allowConsecutiveNewlines = true
 
     private var starReactionButton: ComponentView<Empty>?
     private var liveMicrophoneButton: ComponentView<Empty>?
@@ -4952,24 +4953,41 @@ public class ChatTextInputPanelNode: ChatInputPanelNode, ASEditableTextNodeDeleg
                 }
             }
         }
-                
+        
+        let string = NSMutableAttributedString(attributedString: editableTextNode.attributedText ?? NSAttributedString())
+        var textColor: UIColor = .black
+        var accentTextColor: UIColor = .blue
+        var baseFontSize: CGFloat = 17.0
+        if let presentationInterfaceState = self.presentationInterfaceState {
+            textColor = presentationInterfaceState.theme.chat.inputPanel.inputTextColor
+            accentTextColor = presentationInterfaceState.theme.chat.inputPanel.panelControlAccentColor
+            baseFontSize = max(minInputFontSize, presentationInterfaceState.fontSize.baseDisplaySize)
+            if "".isEmpty {
+                baseFontSize = 17.0
+            }
+        }
+        let cleanReplacementString = textAttributedStringForStateText(context: context, stateText: NSAttributedString(string: cleanText), fontSize: baseFontSize, textColor: textColor, accentTextColor: accentTextColor, writingDirection: nil, spoilersRevealed: self.spoilersRevealed, availableEmojis: (self.context?.animatedEmojiStickersValue.keys).flatMap(Set.init) ?? Set(), emojiViewProvider: self.emojiViewProvider, makeCollapsedQuoteAttachment: { text, attributes in
+            return ChatInputTextCollapsedQuoteAttachmentImpl(text: text, attributes: attributes)
+        })
+        string.replaceCharacters(in: range, with: cleanReplacementString)
+        
+        var resetText = false
         if cleanText != text {
-            let string = NSMutableAttributedString(attributedString: editableTextNode.attributedText ?? NSAttributedString())
-            var textColor: UIColor = .black
-            var accentTextColor: UIColor = .blue
-            var baseFontSize: CGFloat = 17.0
-            if let presentationInterfaceState = self.presentationInterfaceState {
-                textColor = presentationInterfaceState.theme.chat.inputPanel.inputTextColor
-                accentTextColor = presentationInterfaceState.theme.chat.inputPanel.panelControlAccentColor
-                baseFontSize = max(minInputFontSize, presentationInterfaceState.fontSize.baseDisplaySize)
-                if "".isEmpty {
-                    baseFontSize = 17.0
+            resetText = true
+        }
+        
+        if !self.allowConsecutiveNewlines {
+            while string.string.range(of: "\n\n") != nil {
+                if let range = string.string.range(of: "\n\n") {
+                    let rawRange = NSRange(range, in: string.string)
+                    let firstNewline = string.attributedSubstring(from: NSRange(location: rawRange.location, length: 1))
+                    string.replaceCharacters(in: rawRange, with: firstNewline)
+                    resetText = true
                 }
             }
-            let cleanReplacementString = textAttributedStringForStateText(context: context, stateText: NSAttributedString(string: cleanText), fontSize: baseFontSize, textColor: textColor, accentTextColor: accentTextColor, writingDirection: nil, spoilersRevealed: self.spoilersRevealed, availableEmojis: (self.context?.animatedEmojiStickersValue.keys).flatMap(Set.init) ?? Set(), emojiViewProvider: self.emojiViewProvider, makeCollapsedQuoteAttachment: { text, attributes in
-                return ChatInputTextCollapsedQuoteAttachmentImpl(text: text, attributes: attributes)
-            })
-            string.replaceCharacters(in: range, with: cleanReplacementString)
+        }
+                
+        if resetText {
             self.textInputNode?.attributedText = string
             self.textInputNode?.selectedRange = NSMakeRange(range.lowerBound + cleanReplacementString.length, 0)
             self.updateTextNodeText(animated: true)

submodules/TelegramUI/Components/MessageInputPanelComponent/Sources/MessageInputPanelComponent.swift

@@ -1125,6 +1125,7 @@ public final class MessageInputPanelComponent: Component {
                         insets: UIEdgeInsets(top: 0.0, left: 0.0, bottom: component.bottomInset, right: 0.0),
                         maxHeight: availableSize.height,
                         maxLength: component.maxLength,
+                        allowConsecutiveNewlines: false,
                         sendAction: { [weak self] in
                             guard let self, let component = self.component else {
                                 return