Enable setting cursor after the last character (#10670)

* Enable setting cursor after the last character

Resolves #9157

* Reformat the code

* Reformat the code using conventions

2 files changed, 108 insertions, 0 deletions

diff --git a/uitest/src/main/java/com/vaadin/tests/components/textfield/TextFieldTestCursorPosition.java b/uitest/src/main/java/com/vaadin/tests/components/textfield/TextFieldTestCursorPosition.java
new file mode 100644
index 0000000000..612e0f80a8
--- /dev/null
+++ b/uitest/src/main/java/com/vaadin/tests/components/textfield/TextFieldTestCursorPosition.java
@@ -0,0 +1,46 @@
+package com.vaadin.tests.components.textfield;
+
+import com.vaadin.annotations.Widgetset;
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.ui.Button;
+import com.vaadin.ui.TextField;
+
+@Widgetset("com.vaadin.DefaultWidgetSet")
+public class TextFieldTestCursorPosition extends AbstractTestUI {
+
+    static final String DEFAULT_TEXT = "So we have some text to select";
+    static final String BUTTON_SETPOSITION = "buttonPos";
+    static final String BUTTON_SETRANGE = "rS";
+    static final String RANGE_LENGTH_TF = "rLTF";
+    static final String CURSOR_POS_TF = "cpTF";
+    static final int valueLength = DEFAULT_TEXT.length();
+    final TextField textField = new TextField(
+            "Set cursor position after the last character");
+    final TextField textField1 = new TextField("Set Selection range");
+
+    @Override
+    protected void setup(VaadinRequest request) {
+        textField.setValue(DEFAULT_TEXT);
+        textField.setId(CURSOR_POS_TF);
+        textField.setWidth("500px");
+
+        Button posButton = new Button("Set Position to the last character");
+        posButton.setId(BUTTON_SETPOSITION);
+        posButton.addClickListener(
+                c -> textField.setCursorPosition(valueLength));
+        addComponent(textField);
+        addComponent(posButton);
+
+        textField1.setId(RANGE_LENGTH_TF);
+        textField1.setValue(DEFAULT_TEXT);
+        textField1.setWidth("500px");
+
+        Button selButton = new Button("Set selection range");
+        selButton.setId(BUTTON_SETRANGE);
+        selButton.addClickListener(
+                c -> textField1.setSelection(valueLength / 2, valueLength));
+        addComponent(textField1);
+        addComponent(selButton);
+    }
+}
diff --git a/uitest/src/test/java/com/vaadin/tests/components/textfield/TextFieldTestCursorPositionTest.java b/uitest/src/test/java/com/vaadin/tests/components/textfield/TextFieldTestCursorPositionTest.java
new file mode 100644
index 0000000000..fbba6eddcc
--- /dev/null
+++ b/uitest/src/test/java/com/vaadin/tests/components/textfield/TextFieldTestCursorPositionTest.java
@@ -0,0 +1,62 @@
+package com.vaadin.tests.components.textfield;
+
+import com.vaadin.testbench.By;
+import com.vaadin.testbench.elements.ButtonElement;
+import com.vaadin.tests.tb3.MultiBrowserTest;
+import org.junit.Test;
+import org.openqa.selenium.WebElement;
+import static org.junit.Assert.assertEquals;
+
+import java.util.List;
+
+public class TextFieldTestCursorPositionTest extends MultiBrowserTest {
+
+    private WebElement textFieldCheckCursor;
+    private WebElement textFieldCheckRang;
+
+    @Test
+    public void testSelection() {
+        openTestURL();
+        textFieldCheckCursor = findElement(
+                By.id(TextFieldTestCursorPosition.CURSOR_POS_TF));
+        textFieldCheckRang = findElement(
+                By.id(TextFieldTestCursorPosition.RANGE_LENGTH_TF));
+
+        // Range selected correctly
+        setSelectionRange();
+        assertSelection((TextFieldTestCursorPosition.valueLength) / 2,
+                TextFieldTestCursorPosition.valueLength, textFieldCheckRang);
+
+        // Cursor position
+        setCursorPosition();
+        assertCursorPosition(TextFieldTestCursorPosition.valueLength);
+    }
+
+    private void assertCursorPosition(int i) {
+        assertSelection(i, i, textFieldCheckCursor);
+    }
+
+    private void setCursorPosition() {
+        $(ButtonElement.class)
+                .id(TextFieldTestCursorPosition.BUTTON_SETPOSITION).click();
+    }
+
+    private void setSelectionRange() {
+        $(ButtonElement.class).id(TextFieldTestCursorPosition.BUTTON_SETRANGE)
+                .click();
+    }
+
+    // expected and actual
+    private void assertSelection(int start, int length, WebElement textField) {
+        assertEquals(new Selection(start, length), getSelection(textField));
+    }
+
+    private Selection getSelection(WebElement textField) {
+        @SuppressWarnings("unchecked")
+        List<Long> range = (List<Long>) executeScript(
+                "return [arguments[0].selectionStart,arguments[0].selectionEnd]",
+                textField);
+        return new Selection(Math.toIntExact(range.get(0)),
+                Math.toIntExact(range.get(1)));
+    }
+}