Add formatting buttons for WysisygComposer

res/css/_components.pcss

@@ -295,6 +295,7 @@
 @import "./views/rooms/_TopUnreadMessagesBar.pcss";
 @import "./views/rooms/_VoiceRecordComposerTile.pcss";
 @import "./views/rooms/_WhoIsTypingTile.pcss";
+@import "./views/rooms/wysiwyg_composer/_FormattingButtons.pcss";
 @import "./views/rooms/wysiwyg_composer/_WysiwygComposer.pcss";
 @import "./views/settings/_AvatarSetting.pcss";
 @import "./views/settings/_CrossSigningPanel.pcss";

res/css/views/rooms/_MessageComposer.pcss

@@ -233,6 +233,17 @@ limitations under the License.
     }
 }
 
+/*
+    The wysisyg composer increase the size of the MessageComposer. We temporary move the buttons
+    Soon the dom structure of the MessageComposer will change with the next evolution of the wysiwyg composer
+    and this workaround will disappear
+*/
+.mx_MessageComposer_wysiwyg {
+    .mx_MessageComposer_e2eIcon.mx_E2EIcon,.mx_MessageComposer_button, .mx_MessageComposer_sendMessage {
+        margin-top: 22px;
+    }
+}
+
 .mx_MessageComposer_upload::before {
     mask-image: url('$(res)/img/element-icons/room/composer/attach.svg');
 }

res/css/views/rooms/wysiwyg_composer/_FormattingButtons.pcss

@@ -0,0 +1,114 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+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.
+*/
+
+.mx_FormattingButtons {
+    display: flex;
+    justify-content: start;
+
+    .mx_FormattingButtons_Button {
+        --size: 26px;
+        position: relative;
+        cursor: pointer;
+        height: var(--size);
+        line-height: var(--size);
+        width: auto;
+        padding-left: var(--size);
+        margin-right: 6px;
+        background-color: transparent;
+        border: none;
+
+        &:last-child {
+            margin-right: auto;
+        }
+
+        &::before {
+            content: '';
+            position: absolute;
+            top: 7px;
+            left: 7px;
+            height: 12px;
+            width: 12px;
+            background-color: $icon-button-color;
+            mask-repeat: no-repeat;
+            mask-size: contain;
+            mask-position: center;
+        }
+
+        &::after {
+            content: '';
+            position: absolute;
+            left: 0;
+            top: 0;
+            z-index: 0;
+            width: var(--size);
+            height: var(--size);
+            border-radius: 5px;
+        }
+
+        &:hover {
+            &::after {
+                background: rgba($secondary-content, 0.1);
+            }
+
+            &::before {
+                background-color: $secondary-content;
+            }
+        }
+    }
+
+    .mx_FormattingButtons_active {
+        &::after {
+            background: rgba($accent, 0.1);
+        }
+
+        &::before {
+            background-color: $accent;
+        }
+    }
+
+    .mx_FormattingButtons_Button_bold::before {
+        mask-image: url('$(res)/img/element-icons/room/composer/bold.svg');
+    }
+
+    .mx_FormattingButtons_Button_italic::before {
+        mask-image: url('$(res)/img/element-icons/room/composer/italic.svg');
+    }
+
+    .mx_FormattingButtons_Button_underline::before {
+        mask-image: url('$(res)/img/element-icons/room/composer/underline.svg');
+    }
+
+    .mx_FormattingButtons_Button_strike-through::before {
+        mask-image: url('$(res)/img/element-icons/room/composer/strike_through.svg');
+    }
+}
+
+.mx_FormattingButtons_Tooltip {
+    padding: 0 2px 0 2px;
+
+    .mx_FormattingButtons_Tooltip_KeyboardShortcut {
+        color: $tertiary-content;
+
+        kbd {
+            margin-top: 2px;
+            text-align: center;
+            display: inline-block;
+            text-transform: capitalize;
+            font-size: 12px;
+            font-family: Inter, sans-serif;
+        }
+    }
+}