Support setting HEAD from WebUI

Project owners can now change HEAD from the ProjectBranchesScreen.

Change-Id: I1394312bd9bdead3c71772ba35fd2e0798c04d44
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

gerrit-common/src/main/java/com/google/gerrit/common/PageLinks.java

@@ -70,6 +70,10 @@ public class PageLinks {
     return "/admin/projects/" + p.get() + ",access";
   }
 
+  public static String toProjectBranches(Project.NameKey p) {
+    return "/admin/projects/" + p.get() + ",branches";
+  }
+
   public static String toAccountQuery(String fullname, Status status) {
     return toChangeQuery(op("owner", fullname) + " " + status(status), TOP);
   }

gerrit-gwtui/src/main/java/com/google/gerrit/client/GerritCss.java

@@ -106,6 +106,7 @@ public interface GerritCss extends CssResource {
   String downloadLinkListCell();
   String downloadLink_Active();
   String drafts();
+  String editHeadButton();
   String emptySection();
   String errorDialog();
   String errorDialogButtons();

gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/AdminConstants.java

@@ -92,6 +92,8 @@ public interface AdminConstants extends Constants {
   String initialRevision();
   String buttonAddBranch();
   String buttonDeleteBranch();
+  String saveHeadButton();
+  String cancelHeadButton();
 
   String groupItemHelp();
 

gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/AdminConstants.properties

@@ -71,6 +71,8 @@ columnBranchRevision = Revision
 initialRevision = Initial Revision
 buttonAddBranch = Create Branch
 buttonDeleteBranch = Delete
+saveHeadButton = Save
+cancelHeadButton = Cancel
 
 groupItemHelp = group
 

gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/ProjectBranchesScreen.java

@@ -25,10 +25,13 @@ import com.google.gerrit.client.access.ProjectAccessInfo;
 import com.google.gerrit.client.projects.BranchInfo;
 import com.google.gerrit.client.projects.ProjectApi;
 import com.google.gerrit.client.rpc.GerritCallback;
+import com.google.gerrit.client.rpc.NativeString;
 import com.google.gerrit.client.rpc.Natives;
 import com.google.gerrit.client.rpc.ScreenLoadCallback;
 import com.google.gerrit.client.ui.FancyFlexTable;
 import com.google.gerrit.client.ui.HintTextBox;
+import com.google.gerrit.client.ui.OnEditEnabler;
+import com.google.gerrit.common.PageLinks;
 import com.google.gerrit.reviewdb.client.Branch;
 import com.google.gerrit.reviewdb.client.Project;
 import com.google.gwt.core.client.JsArray;
@@ -47,8 +50,11 @@ import com.google.gwt.user.client.ui.CheckBox;
 import com.google.gwt.user.client.ui.FlexTable.FlexCellFormatter;
 import com.google.gwt.user.client.ui.FlowPanel;
 import com.google.gwt.user.client.ui.Grid;
+import com.google.gwt.user.client.ui.Image;
+import com.google.gwt.user.client.ui.InlineLabel;
 import com.google.gwt.user.client.ui.TextBox;
 import com.google.gwt.user.client.ui.Widget;
+import com.google.gwtexpui.globalkey.client.NpTextBox;
 import com.google.gwtexpui.safehtml.client.SafeHtmlBuilder;
 
 import java.util.Comparator;
@@ -371,7 +377,11 @@ public class ProjectBranchesScreen extends ProjectScreen {
       table.setText(row, 2, k.getShortName());
 
       if (k.revision() != null) {
-        table.setText(row, 3, k.revision());
+        if ("HEAD".equals(k.getShortName())) {
+          setHeadRevision(row, 3, k.revision());
+        } else {
+          table.setText(row, 3, k.revision());
+        }
       } else {
         table.setText(row, 3, "");
       }
@@ -400,6 +410,92 @@ public class ProjectBranchesScreen extends ProjectScreen {
       setRowItem(row, k);
     }
 
+    private void setHeadRevision(final int row, final int column,
+        final String rev) {
+      AccessMap.get(getProjectKey(),
+          new GerritCallback<ProjectAccessInfo>() {
+            @Override
+            public void onSuccess(ProjectAccessInfo result) {
+              if (result.isOwner()) {
+                table.setWidget(row, column, getHeadRevisionWidget(rev));
+              } else {
+                table.setText(row, 3, rev);
+              }
+            }
+          });
+    }
+
+    private Widget getHeadRevisionWidget(final String headRevision) {
+      FlowPanel p = new FlowPanel();
+      final InlineLabel l = new InlineLabel(headRevision);
+      final Image edit = new Image(Gerrit.RESOURCES.edit());
+      edit.addStyleName(Gerrit.RESOURCES.css().editHeadButton());
+
+      final NpTextBox input = new NpTextBox();
+      input.setVisibleLength(35);
+      input.setValue(headRevision);
+      input.setVisible(false);
+      final Button save = new Button();
+      save.setText(Util.C.saveHeadButton());
+      save.setVisible(false);
+      save.setEnabled(false);
+      final Button cancel = new Button();
+      cancel.setText(Util.C.cancelHeadButton());
+      cancel.setVisible(false);
+
+      OnEditEnabler e = new OnEditEnabler(save);
+      e.listenTo(input);
+
+      edit.addClickHandler(new  ClickHandler() {
+        @Override
+        public void onClick(ClickEvent event) {
+          l.setVisible(false);
+          edit.setVisible(false);
+          input.setVisible(true);
+          save.setVisible(true);
+          cancel.setVisible(true);
+        }
+      });
+      save.addClickHandler(new  ClickHandler() {
+        @Override
+        public void onClick(ClickEvent event) {
+          save.setEnabled(false);
+          ProjectApi.setHead(getProjectKey(), input.getValue().trim(),
+              new GerritCallback<NativeString>() {
+            @Override
+            public void onSuccess(NativeString result) {
+              Gerrit.display(PageLinks.toProjectBranches(getProjectKey()));
+            }
+
+            @Override
+            public void onFailure(Throwable caught) {
+              super.onFailure(caught);
+              save.setEnabled(true);
+            }
+          });
+        }
+      });
+      cancel.addClickHandler(new  ClickHandler() {
+        @Override
+        public void onClick(ClickEvent event) {
+          l.setVisible(true);
+          edit.setVisible(true);
+          input.setVisible(false);
+          input.setValue(headRevision);
+          save.setVisible(false);
+          save.setEnabled(false);
+          cancel.setVisible(false);
+        }
+      });
+
+      p.add(l);
+      p.add(edit);
+      p.add(input);
+      p.add(save);
+      p.add(cancel);
+      return p;
+    }
+
     boolean hasBranchCanDelete() {
       return canDelete;
     }

gerrit-gwtui/src/main/java/com/google/gerrit/client/gerrit.css

@@ -1571,6 +1571,11 @@ a:hover.downloadLink {
   padding: 2px 6px 1px;
 }
 
+.editHeadButton {
+  float: right;
+  cursor: pointer;
+}
+
 /** PluginListScreen **/
 .pluginsTable {
 }

gerrit-gwtui/src/main/java/com/google/gerrit/client/projects/ProjectApi.java

@@ -136,6 +136,14 @@ public class ProjectApi {
     }
   }
 
+  public static void setHead(Project.NameKey name, String ref,
+      AsyncCallback<NativeString> cb) {
+    RestApi call = project(name).view("HEAD");
+    HeadInput input = HeadInput.create();
+    input.setRef(ref);
+    call.put(input, cb);
+  }
+
   public static RestApi project(Project.NameKey name) {
     return new RestApi("/projects/").id(name.get());
   }
@@ -229,4 +237,15 @@ public class ProjectApi {
 
     final native void setDescription(String d) /*-{ if(d)this.description=d; }-*/;
   }
+
+  private static class HeadInput extends JavaScriptObject {
+    static HeadInput create() {
+      return createObject().cast();
+    }
+
+    protected HeadInput() {
+    }
+
+    final native void setRef(String r) /*-{ if(r)this.ref=r; }-*/;
+  }
 }