Fix Panel.setScrollTop() for large values (#8563)

Fixes #1149

diff --git a/client/src/main/java/com/vaadin/client/ui/panel/PanelConnector.java b/client/src/main/java/com/vaadin/client/ui/panel/PanelConnector.java
index 5766851bbabb036b849defc5bfbde993e66b31a7..9cf90b625463fab0e51ca4770d9ffbd16a2fca16 100644 (file)
--- a/client/src/main/java/com/vaadin/client/ui/panel/PanelConnector.java
+++ b/client/src/main/java/com/vaadin/client/ui/panel/PanelConnector.java
@@ -226,7 +226,14 @@ public class PanelConnector extends AbstractSingleComponentContainerConnector
     public void postLayout() {
         VPanel panel = getWidget();
         if (uidlScrollTop != null) {
+            // IE / Safari fix for when scroll top is set to greater than panel
+            // height
+            int maxScroll = panel.getWidget().getOffsetHeight();
+            if (uidlScrollTop > maxScroll) {
+                uidlScrollTop = maxScroll;
+            }
             panel.contentNode.setScrollTop(uidlScrollTop.intValue());
+
             // Read actual value back to ensure update logic is correct
             // TODO Does this trigger reflows?
             panel.scrollTop = panel.contentNode.getScrollTop();

diff --git a/uitest/src/main/java/com/vaadin/tests/components/panel/PanelSetScrollTopWithLargeNumber.java b/uitest/src/main/java/com/vaadin/tests/components/panel/PanelSetScrollTopWithLargeNumber.java
new file mode 100755 (executable)
index 0000000..7d58b67
--- /dev/null
+++ b/uitest/src/main/java/com/vaadin/tests/components/panel/PanelSetScrollTopWithLargeNumber.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2000-2017 Vaadin Ltd.
+ *
+ * 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.
+ */
+package com.vaadin.tests.components.panel;
+
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.shared.ui.label.ContentMode;
+import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.ui.Label;
+import com.vaadin.ui.Panel;
+import com.vaadin.ui.VerticalLayout;
+
+public class PanelSetScrollTopWithLargeNumber extends AbstractTestUI {
+
+    Panel panel = new Panel();
+
+    @Override
+    public String getDescription() {
+        return "Click the button to scroll down " + Integer.MAX_VALUE
+                + " pixels";
+    }
+
+    @Override
+    protected Integer getTicketNumber() {
+        return 1149;
+    }
+
+    @Override
+    protected void setup(VaadinRequest request) {
+        final VerticalLayout layout = new VerticalLayout();
+        layout.setSizeUndefined();
+        panel.setHeight("500px");
+        String s = "";
+        for (int i = 0; i < 10000; i++) {
+            s += i + "<br />";
+        }
+        Label label = new Label(s, ContentMode.HTML);
+        layout.addComponent(label);
+        panel.setContent(layout);
+        panel.setScrollTop(Integer.MAX_VALUE);
+        addComponent(panel);
+    }
+
+}

diff --git a/uitest/src/test/java/com/vaadin/tests/components/panel/PanelSetScrollTopWithLargeNumberTest.java b/uitest/src/test/java/com/vaadin/tests/components/panel/PanelSetScrollTopWithLargeNumberTest.java
new file mode 100755 (executable)
index 0000000..9ddaf71
--- /dev/null
+++ b/uitest/src/test/java/com/vaadin/tests/components/panel/PanelSetScrollTopWithLargeNumberTest.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2000-2017 Vaadin Ltd.
+ *
+ * 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.
+ */
+package com.vaadin.tests.components.panel;
+
+import org.junit.Test;
+import org.openqa.selenium.By;
+import org.openqa.selenium.WebElement;
+
+import com.vaadin.testbench.elements.PanelElement;
+import com.vaadin.tests.tb3.MultiBrowserTest;
+
+public class PanelSetScrollTopWithLargeNumberTest extends MultiBrowserTest {
+    private PanelElement panel;
+
+    @Override
+    public void setup() throws Exception {
+        super.setup();
+        openTestURL();
+        waitForElementPresent(By.className("v-panel"));
+        panel = $(PanelElement.class).first();
+    }
+
+    @Test
+    public void testSetScrollTopWithLargeNumber() {
+        WebElement contentNode = panel
+                .findElement(By.className("v-panel-content"));
+        int panelContentScrollTop = ((Number) executeScript(
+                "return arguments[0].scrollTop", contentNode)).intValue();
+        assertGreater(
+                "Panel should scroll when scrollTop is set to a number larger than panel height",
+                panelContentScrollTop, 0);
+    }
+
+}