From 42e2dbbd484f0c6e822725d5fc3a1ab0cdf267cc Mon Sep 17 00:00:00 2001
From: Jan Prochazka <jan.prochazka@gmail.com>
Date: Sun, 29 Mar 2020 20:32:53 +0200
Subject: [PATCH] copy to clipboard event

---
 packages/web/src/datagrid/DataGridCore.js | 42 ++++++++++++++++-
 packages/web/src/utility/clipboard.js     | 56 +++++++++++++++++++++++
 2 files changed, 97 insertions(+), 1 deletion(-)
 create mode 100644 packages/web/src/utility/clipboard.js

diff --git a/packages/web/src/datagrid/DataGridCore.js b/packages/web/src/datagrid/DataGridCore.js
index b740644f7..7bfcfe831 100644
--- a/packages/web/src/datagrid/DataGridCore.js
+++ b/packages/web/src/datagrid/DataGridCore.js
@@ -37,6 +37,7 @@ import {
 } from '@dbgate/datalib';
 import { scriptToSql } from '@dbgate/sqltree';
 import { sleep } from '../utility/common';
+import { copyTextToClipboard } from '../utility/clipboard';
 
 const GridContainer = styled.div`
   position: absolute;
@@ -324,6 +325,34 @@ export default function DataGridCore(props) {
     }
   }
 
+  function handleCopy(event) {
+    if (event && event.target.localName == 'input') return;
+    if (event) event.preventDefault();
+    copyToClipboard();
+  }
+
+  // function handlePaste(event) {
+  //   console.log('PASTE', event);
+  // }
+
+  function copyToClipboard() {
+    const rowIndexes = _.uniq(selectedCells.map(x => x[0])).sort();
+    const lines = rowIndexes.map(rowIndex => {
+      const colIndexes = selectedCells
+        .filter(x => x[0] == rowIndex)
+        .map(x => x[1])
+        .sort();
+      const rowData = loadedAndInsertedRows[rowIndex];
+      const line = colIndexes
+        .map(columnUniqueName)
+        .map(col => (rowData[col] == null ? '' : rowData[col]))
+        .join('\t');
+      return line;
+    });
+    const text = lines.join('\r\n');
+    copyTextToClipboard(text);
+  }
+
   function handleGridMouseMove(event) {
     if (autofillDragStartCell) {
       const cell = cellFromEvent(event);
@@ -339,6 +368,10 @@ export default function DataGridCore(props) {
     }
   }
 
+  function columnUniqueName(columnIndex) {
+    return columns[columnSizes.realToModel(columnIndex)].uniqueName;
+  }
+
   function handleGridMouseUp(event) {
     if (dragStartCell) {
       const cell = cellFromEvent(event);
@@ -351,7 +384,7 @@ export default function DataGridCore(props) {
       if (_.isNumber(currentRowNumber)) {
         const rowIndexes = _.uniq((autofillSelectedCells || []).map(x => x[0])).filter(x => x != currentRowNumber);
         // @ts-ignore
-        const colNames = selectedCells.map(cell => columns[columnSizes.realToModel(cell[1])].uniqueName);
+        const colNames = selectedCells.map(cell => columnUniqueName(cell[1]));
         const changeObject = _.pick(loadedAndInsertedRows[currentRowNumber], colNames);
         setChangeSet(
           batchUpdateChangeSet(
@@ -465,6 +498,11 @@ export default function DataGridCore(props) {
       revertRowChanges();
     }
 
+    if (event.keyCode == keycodes.c && event.ctrlKey) {
+      event.preventDefault();
+      copyToClipboard();
+    }
+
     if (event.keyCode == keycodes.delete && event.ctrlKey) {
       event.preventDefault();
       deleteCurrentRow();
@@ -668,6 +706,8 @@ export default function DataGridCore(props) {
         onMouseUp={handleGridMouseUp}
         onKeyDown={handleGridKeyDown}
         onWheel={handleGridWheel}
+        onCopy={handleCopy}
+        // onPasteCapture={handlePaste}
         // table can be focused
         tabIndex={-1}
         ref={tableRef}
diff --git a/packages/web/src/utility/clipboard.js b/packages/web/src/utility/clipboard.js
new file mode 100644
index 000000000..dabbe22d1
--- /dev/null
+++ b/packages/web/src/utility/clipboard.js
@@ -0,0 +1,56 @@
+export function copyTextToClipboard(text) {
+  const textArea = document.createElement('textarea');
+
+  //
+  // *** This styling is an extra step which is likely not required. ***
+  //
+  // Why is it here? To ensure:
+  // 1. the element is able to have focus and selection.
+  // 2. if element was to flash render it has minimal visual impact.
+  // 3. less flakyness with selection and copying which **might** occur if
+  //    the textarea element is not visible.
+  //
+  // The likelihood is the element won't even render, not even a flash,
+  // so some of these are just precautions. However in IE the element
+  // is visible whilst the popup box asking the user for permission for
+  // the web page to copy to the clipboard.
+  //
+
+  // Place in top-left corner of screen regardless of scroll position.
+  textArea.style.position = 'fixed';
+  textArea.style.top = '0';
+  textArea.style.left = '0';
+
+  // Ensure it has a small width and height. Setting to 1px / 1em
+  // doesn't work as this gives a negative w/h on some browsers.
+  textArea.style.width = '2em';
+  textArea.style.height = '2em';
+
+  // We don't need padding, reducing the size if it does flash render.
+  textArea.style.padding = '0';
+
+  // Clean up any borders.
+  textArea.style.border = 'none';
+  textArea.style.outline = 'none';
+  textArea.style.boxShadow = 'none';
+
+  // Avoid flash of white box if rendered for any reason.
+  textArea.style.background = 'transparent';
+
+  textArea.value = text;
+
+  document.body.appendChild(textArea);
+
+  textArea.select();
+
+  try {
+    let successful = document.execCommand('copy');
+    if (!successful) {
+      console.log('Failed copy to clipboard');
+    }
+  } catch (err) {
+    console.log('Failed copy to clipboard: ' + err);
+  }
+
+  document.body.removeChild(textArea);
+}