vector-im/element-ios/issues/5114 - Poll creation screen

- added input toolbar poll creation action.
- reordered input toolbar actions as per designs.
- added multiline text field and extracted common components.

RiotSwiftUI/Modules/Common/Util/PrimaryActionButtonStyle.swift

@@ -0,0 +1,52 @@
+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import SwiftUI
+
+@available(iOS 14.0, *)
+struct PrimaryActionButtonStyle: ButtonStyle {
+    @Environment(\.theme) private var theme: ThemeSwiftUI
+    
+    var enabled: Bool = false
+    
+    func makeBody(configuration: Self.Configuration) -> some View {
+        configuration.label
+            .padding(12.0)
+            .frame(maxWidth: .infinity)
+            .foregroundColor(.white)
+            .font(theme.fonts.body)
+            .background(configuration.isPressed ? theme.colors.accent.opacity(0.6) : theme.colors.accent)
+            .opacity(enabled ? 1.0 : 0.6)
+            .cornerRadius(8.0)
+    }
+}
+
+@available(iOS 14.0, *)
+struct PrimaryActionButtonStyle_Previews: PreviewProvider {
+    static var previews: some View {
+        Group {
+            VStack {
+                Button("Enabled") { }
+                    .buttonStyle(PrimaryActionButtonStyle(enabled: true))
+                
+                Button("Disabled") { }
+                    .buttonStyle(PrimaryActionButtonStyle(enabled: false))
+                    .disabled(true)
+            }
+            .padding()
+        }
+    }
+}