1 files changed, 117 insertions, 0 deletions
diff --git a/server/sonar-ui-common/components/controls/ScreenPositionFixer.tsx b/server/sonar-ui-common/components/controls/ScreenPositionFixer.tsx
new file mode 100644
index 00000000000..69c00f8404e
--- /dev/null
+++ b/server/sonar-ui-common/components/controls/ScreenPositionFixer.tsx
@@ -0,0 +1,117 @@
+/*
+ * Sonar UI Common
+ * Copyright (C) 2019-2020 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+import { throttle } from 'lodash';
+import * as React from 'react';
+import { findDOMNode } from 'react-dom';
+import { Theme, withTheme } from '../theme';
+
+interface Props {
+  /**
+   * First time `children` are rendered with `undefined` fixes to measure the offset.
+   * Second time it renders with the computed fixes.
+   */
+  children: (props: Fixes) => React.ReactNode;
+
+  /**
+   * Use this flag to force re-positioning.
+   * Use cases:
+   *   - when you need to measure `children` size first
+   *   - when you load content asynchronously
+   */
+  ready?: boolean;
+  theme: Theme;
+}
+
+interface Fixes {
+  leftFix?: number;
+  topFix?: number;
+}
+
+export class ScreenPositionFixer extends React.Component<Props, Fixes> {
+  throttledPosition: () => void;
+
+  constructor(props: Props) {
+    super(props);
+    this.state = {};
+    this.throttledPosition = throttle(this.position, 50);
+  }
+
+  componentDidMount() {
+    this.addEventListeners();
+    this.position();
+  }
+
+  componentDidUpdate(prevProps: Props) {
+    if (!prevProps.ready && this.props.ready) {
+      this.position();
+    } else if (prevProps.ready && !this.props.ready) {
+      this.reset();
+    }
+  }
+
+  componentWillUnmount() {
+    this.removeEventListeners();
+  }
+
+  addEventListeners = () => {
+    window.addEventListener('resize', this.throttledPosition);
+  };
+
+  removeEventListeners = () => {
+    window.removeEventListener('resize', this.throttledPosition);
+  };
+
+  reset = () => {
+    this.setState({ leftFix: undefined, topFix: undefined });
+  };
+
+  position = () => {
+    const edgeMargin = 0.5 * this.props.theme.rawSizes.grid;
+
+    // eslint-disable-next-line react/no-find-dom-node
+    const node = findDOMNode(this);
+    if (node && node instanceof Element) {
+      const { width, height, left, top } = node.getBoundingClientRect();
+      const { clientHeight, clientWidth } = document.documentElement;
+
+      let leftFix = 0;
+      if (left < edgeMargin) {
+        leftFix = edgeMargin - left;
+      } else if (left + width > clientWidth - edgeMargin) {
+        leftFix = clientWidth - edgeMargin - left - width;
+      }
+
+      let topFix = 0;
+      if (top < edgeMargin) {
+        topFix = edgeMargin - top;
+      } else if (top + height > clientHeight - edgeMargin) {
+        topFix = clientHeight - edgeMargin - top - height;
+      }
+
+      this.setState({ leftFix, topFix });
+    }
+  };
+
+  render() {
+    return this.props.children(this.state);
+  }
+}
+
+export default withTheme(ScreenPositionFixer);