[IOAPPFD0-172] Add loading state to the ButtonSolid (with custom transitions)

example/src/pages/Buttons.tsx

@@ -15,7 +15,7 @@ import {
   VSpacer,
   useIOExperimentalDesign
 } from "@pagopa/io-app-design-system";
-import React from "react";
+import React, { useState } from "react";
 import { Alert, StyleSheet, View } from "react-native";
 import { ComponentViewerBox } from "../components/ComponentViewerBox";
 import { Screen } from "../components/Screen";
@@ -95,14 +95,15 @@ export const Buttons = () => {
         </View>
       </ComponentViewerBox>
       <ComponentViewerBox name="ButtonSolid · Primary, Full width">
-        <View>
-          <ButtonSolid
-            fullWidth
-            accessibilityLabel="Tap to trigger test alert"
-            label={"Primary button (full width)"}
-            onPress={onButtonPress}
-          />
-        </View>
+        <ButtonSolid
+          fullWidth
+          accessibilityLabel="Tap to trigger test alert"
+          label={"Primary button (full width)"}
+          onPress={onButtonPress}
+        />
+      </ComponentViewerBox>
+      <ComponentViewerBox name="ButtonSolid · Primary · Full width, loading state">
+        <LoadingSolidButtonExample />
       </ComponentViewerBox>
       <ComponentViewerBox name="ButtonSolid · Primary, disabled">
         <View>
@@ -244,6 +245,22 @@ export const Buttons = () => {
           </View>
         </ComponentViewerBox>
 
+        <ComponentViewerBox
+          name="ButtonSolid · Contrast, full width, loading state"
+          colorMode="dark"
+        >
+          <View>
+            <ButtonSolid
+              fullWidth
+              loading
+              color="contrast"
+              label={"Contrast button"}
+              onPress={onButtonPress}
+              accessibilityLabel="Tap to trigger test alert"
+            />
+          </View>
+        </ComponentViewerBox>
+
         <ComponentViewerBox
           name="ButtonSolid · Contrast, disabled"
           colorMode="dark"
@@ -825,3 +842,25 @@ export const Buttons = () => {
     </Screen>
   );
 };
+
+const LoadingSolidButtonExample = () => {
+  const [isEnabled, setIsEnabled] = useState(false);
+  const toggleSwitch = () => setIsEnabled(previousState => !previousState);
+
+  return (
+    <View>
+      <ButtonSolid
+        fullWidth
+        loading={isEnabled}
+        accessibilityLabel="Tap to trigger test alert"
+        label={"Primary button"}
+        onPress={() => setIsEnabled(true)}
+      />
+      <ListItemSwitch
+        label="Abilita lo stato di caricamento"
+        onSwitchValueChange={toggleSwitch}
+        value={isEnabled}
+      />
+    </View>
+  );
+};

src/components/buttons/ButtonSolid.tsx

@@ -9,6 +9,7 @@ import Animated, {
   useSharedValue,
   withSpring
 } from "react-native-reanimated";
+import ReactNativeHapticFeedback from "react-native-haptic-feedback";
 import { IOIconSizeScale, IOIcons, Icon } from "../icons";
 import { WithTestID } from "../../utils/types";
 import { HSpacer } from "../spacer/Spacer";
@@ -19,8 +20,12 @@ import {
   IOColors,
   IOScaleValues,
   IOSpringValues,
+  enterTransitionInnerContent,
+  enterTransitionInnerContentSmall,
+  exitTransitionInnerContent,
   useIOExperimentalDesign
 } from "../../core";
+import { LoadingSpinner } from "../loadingSpinner";
 
 type ButtonSolidColor = "primary" | "danger" | "contrast";
 
@@ -65,6 +70,10 @@ export type ButtonSolidProps = WithTestID<{
    * @default false
    */
   fullWidth?: boolean;
+  /**
+   * @default false
+   */
+  loading?: boolean;
   /**
    * @default false
    */
@@ -152,6 +161,7 @@ export const ButtonSolid = React.memo(
     label,
     fullWidth = false,
     disabled = false,
+    loading = false,
     icon,
     iconPosition = "start",
     onPress,
@@ -211,60 +221,95 @@ export const ButtonSolid = React.memo(
       isPressed.value = 0;
     }, [isPressed]);
 
+    const handleOnPress = useCallback(
+      (event: GestureResponderEvent) => {
+        /* Don't call `onPress` if the button is
+        in loading state */
+        if (loading) {
+          return;
+        }
+        ReactNativeHapticFeedback.trigger("impactLight");
+        onPress(event);
+      },
+      [loading, onPress]
+    );
+
     // Label & Icons colors
     const foregroundColor: IOColors = disabled
       ? colorMap[color]?.label?.disabled
       : colorMap[color]?.label?.default;
 
     return (
       <Pressable
+        testID={testID}
+        accessible={true}
         accessibilityLabel={accessibilityLabel}
         accessibilityHint={accessibilityHint}
+        accessibilityState={{ busy: loading }}
         accessibilityRole={"button"}
-        testID={testID}
-        onPress={onPress}
+        onPress={handleOnPress}
         onPressIn={onPressIn}
         onPressOut={onPressOut}
-        accessible={true}
         disabled={disabled}
         style={!fullWidth ? IOButtonStyles.dimensionsDefault : {}}
       >
         <Animated.View
           style={[
             buttonStyles.button,
+            { overflow: "hidden" },
             isExperimental && fullWidth && { paddingHorizontal: 16 },
-            iconPosition === "end" && { flexDirection: "row-reverse" },
             buttonStyles.buttonSizeDefault,
             disabled
               ? isExperimental
                 ? styles.backgroundDisabled
                 : legacyStyles.backgroundDisabled
               : { backgroundColor: colorMap[color]?.default },
             /* Prevent Reanimated from overriding background colors
-                    if button is disabled */
+              if button is disabled */
             !disabled && pressedAnimationStyle
           ]}
         >
-          {icon && (
-            <>
-              {/* If 'iconPosition' is set to 'end', we use 
+          {loading && (
+            <Animated.View
+              style={buttonStyles.buttonInner}
+              entering={enterTransitionInnerContentSmall}
+              exiting={exitTransitionInnerContent}
+            >
+              <LoadingSpinner color={foregroundColor} />
+            </Animated.View>
+          )}
+
+          {!loading && (
+            <Animated.View
+              style={[
+                buttonStyles.buttonInner,
+                iconPosition === "end" && { flexDirection: "row-reverse" }
+              ]}
+              entering={enterTransitionInnerContent}
+              exiting={exitTransitionInnerContent}
+            >
+              {icon && (
+                <>
+                  {/* If 'iconPosition' is set to 'end', we use 
             reverse flex property to invert the position */}
-              <Icon name={icon} size={iconSize} color={foregroundColor} />
-              {/* Once we have support for 'gap' property,
+                  <Icon name={icon} size={iconSize} color={foregroundColor} />
+                  {/* Once we have support for 'gap' property,
             we can get rid of that spacer */}
-              <HSpacer size={8} />
-            </>
+                  <HSpacer size={8} />
+                </>
+              )}
+              <ButtonText
+                color={foregroundColor}
+                style={IOButtonStyles.label}
+                numberOfLines={1}
+                ellipsizeMode="tail"
+                allowFontScaling={isExperimental}
+                maxFontSizeMultiplier={1.3}
+              >
+                {label}
+              </ButtonText>
+            </Animated.View>
           )}
-          <ButtonText
-            color={foregroundColor}
-            style={IOButtonStyles.label}
-            numberOfLines={1}
-            ellipsizeMode="tail"
-            allowFontScaling={isExperimental}
-            maxFontSizeMultiplier={1.3}
-          >
-            {label}
-          </ButtonText>
         </Animated.View>
       </Pressable>
     );

src/components/buttons/__test__/__snapshots__/button.test.tsx.snap

@@ -371,7 +371,7 @@ exports[`Test Buttons Components ButtonSolid Snapshot 1`] = `
   accessibilityRole="button"
   accessibilityState={
     {
-      "busy": undefined,
+      "busy": false,
       "checked": undefined,
       "disabled": false,
       "expanded": undefined,
@@ -416,7 +416,9 @@ exports[`Test Buttons Components ButtonSolid Snapshot 1`] = `
           "paddingHorizontal": 16,
           "textAlignVertical": "center",
         },
-        false,
+        {
+          "overflow": "hidden",
+        },
         false,
         {
           "height": 40,
@@ -435,40 +437,55 @@ exports[`Test Buttons Components ButtonSolid Snapshot 1`] = `
       ]
     }
   >
-    <Text
-      allowFontScaling={false}
-      color="white"
-      defaultColor="white"
-      defaultWeight="Bold"
-      ellipsizeMode="tail"
-      font="TitilliumWeb"
-      fontStyle={
-        {
-          "fontSize": 16,
-        }
-      }
-      maxFontSizeMultiplier={1.3}
-      numberOfLines={1}
+    <View
+      entering={[Function]}
+      exiting={[Function]}
       style={
         [
           {
-            "alignSelf": "center",
-          },
-          {
-            "fontSize": 16,
-          },
-          {
-            "color": "#FFFFFF",
-            "fontFamily": "Titillium Web",
-            "fontStyle": "normal",
-            "fontWeight": "700",
+            "alignItems": "center",
+            "flexDirection": "row",
+            "justifyContent": "center",
           },
+          false,
         ]
       }
-      weight="Bold"
     >
-      label
-    </Text>
+      <Text
+        allowFontScaling={false}
+        color="white"
+        defaultColor="white"
+        defaultWeight="Bold"
+        ellipsizeMode="tail"
+        font="TitilliumWeb"
+        fontStyle={
+          {
+            "fontSize": 16,
+          }
+        }
+        maxFontSizeMultiplier={1.3}
+        numberOfLines={1}
+        style={
+          [
+            {
+              "alignSelf": "center",
+            },
+            {
+              "fontSize": 16,
+            },
+            {
+              "color": "#FFFFFF",
+              "fontFamily": "Titillium Web",
+              "fontStyle": "normal",
+              "fontWeight": "700",
+            },
+          ]
+        }
+        weight="Bold"
+      >
+        label
+      </Text>
+    </View>
   </View>
 </View>
 `;

src/core/IOStyles.ts

@@ -117,6 +117,11 @@ export const IOButtonLegacyStyles = StyleSheet.create({
     // paddingHorizontal: PixelRatio.getFontScale() * 16,
     // borderRadius: PixelRatio.getFontScale() * 8
   },
+  buttonInner: {
+    flexDirection: "row",
+    alignItems: "center",
+    justifyContent: "center"
+  },
   /* Labels */
   label: {
     alignSelf: "center"
@@ -152,6 +157,11 @@ export const IOButtonStyles = StyleSheet.create({
     // paddingHorizontal: PixelRatio.getFontScale() * 16,
     // borderRadius: PixelRatio.getFontScale() * 8
   },
+  buttonInner: {
+    flexDirection: "row",
+    alignItems: "center",
+    justifyContent: "center"
+  },
   buttonLink: {
     flexDirection: "row",
     alignItems: "center",