Java Form.getBackCommand方法代码示例

import com.codename1.ui.Form; //导入方法依赖的package包/类
/**
 * Useful tool to refresh the current state of a form shown using show form
 * without pushing another instance to the back stack
 */
public void reloadForm() {
    Form currentForm = Display.getInstance().getCurrent();
    Command backCommand = currentForm.getBackCommand(); 
    Form newForm = (Form)createContainer(fetchResourceFile(), currentForm.getName());

    if (backCommand != null) {
        setBackCommand(newForm, backCommand);

        // trigger listener creation if this is the only command in the form
        getFormListenerInstance(newForm, null);
        
        for(int iter = 0 ; iter < currentForm.getCommandCount() ; iter++) {
            if(backCommand == currentForm.getCommand(iter)) {
                newForm.addCommand(backCommand, newForm.getCommandCount());
                break;
            }
        }
    }
    
    beforeShow(newForm);
    Transition tin = newForm.getTransitionInAnimator();
    Transition tout = newForm.getTransitionOutAnimator();
    currentForm.setTransitionInAnimator(CommonTransitions.createEmpty());
    currentForm.setTransitionOutAnimator(CommonTransitions.createEmpty());
    newForm.setTransitionInAnimator(CommonTransitions.createEmpty());
    newForm.setTransitionOutAnimator(CommonTransitions.createEmpty());
    newForm.layoutContainer();
    newForm.show();
    postShowImpl(newForm);
    newForm.setTransitionInAnimator(tin);
    newForm.setTransitionOutAnimator(tout);
}
 

import com.codename1.ui.Form; //导入方法依赖的package包/类
/**
 * Executes the back command for the current form, similarly to pressing the back button
 */
public static void goBack() {
    if(verbose) {
        log("goBack()");
    }
    Form f = Display.getInstance().getCurrent();
    Command c = f.getBackCommand();
    assertBool(c != null, "The current form doesn't have a back command at this moment! for form name " + f.getName());
    f.dispatchCommand(c, new ActionEvent(c,ActionEvent.Type.Command));
    waitFor(20);
}
 

import com.codename1.ui.Form; //导入方法依赖的package包/类
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    super.onOptionsItemSelected(item);

    final Form currentForm = Display.getInstance().getCurrent();
    if (currentForm == null) {
        return false;
    }
    Command cmd = null;
    final boolean[] tmpProp = new boolean[1];
    if (item.getItemId() == android.R.id.home) {
        cmd = currentForm.getBackCommand();
        if (cmd == null) {
            return false;
        }
        cmd.putClientProperty("source", "ActionBar");
        tmpProp[0] = true;
    }

    int commandIndex = item.getItemId();
    if (cmd == null) {
        cmd = currentForm.getCommand(commandIndex);
    }
    final Command command = cmd;
    final ActionEvent actionEvent = new ActionEvent(command);

    //stop edit if the keybaord is open
    AndroidImplementation.stopEditing();
    // Protect ourselves from commands that misbehave. A crash here will crash the entire application
    Display.getInstance().callSerially(new Runnable() {
        @Override
        public void run() {
            try {
                currentForm.dispatchCommand(command, actionEvent);
                //remove the temp source property
                if (tmpProp[0]) {
                    command.putClientProperty("source", null);
                }
            } catch (Throwable e) {
                Log.e("CodenameOneActivity.onOptionsItemSelected", e.toString() + Log.getStackTraceString(e));
            }
        }
    });

    return true;
}
 

import com.codename1.ui.Form; //导入方法依赖的package包/类
Form createForm(Form f) {
    Form currentForm = Display.getInstance().getCurrent();
    if(currentForm != null && currentForm instanceof Dialog) {
        ((Dialog)Display.getInstance().getCurrent()).dispose();
        currentForm = Display.getInstance().getCurrent();
    }
    Vector formNavigationStack = baseFormNavigationStack;
    if(formNavigationStack != null && !(f instanceof Dialog) && !f.getName().equals(homeForm)) {
        if(currentForm != null) {
            String nextForm = (String)f.getClientProperty("%next_form%");

            // we are in the sidemenu view we should really be using the parent form
            SideMenuBar b = (SideMenuBar)currentForm.getClientProperty("cn1$sideMenuParent");
            if(b != null) {
                currentForm = b.getParentForm();
            }

            // don't add back commands to transitional forms
            if(nextForm == null) {
                String commandAction = currentForm.getName();
                if(allowBackTo(commandAction) && f.getBackCommand() == null) {
                    Command backCommand;
                    if(isSameBackDestination(currentForm, f)) {
                        backCommand = currentForm.getBackCommand();
                    } else {
                        backCommand = createCommandImpl(getBackCommandText(currentForm.getTitle()), null,
                            BACK_COMMAND_ID, commandAction, true, "");
                        backCommand.putClientProperty(COMMAND_ARGUMENTS, "");
                        backCommand.putClientProperty(COMMAND_ACTION, commandAction);
                    }
                    if(backCommand != null) {
                        setBackCommand(f, backCommand);
                    }

                    // trigger listener creation if this is the only command in the form
                    getFormListenerInstance(f, null);
                    formNavigationStack.addElement(getFormState(currentForm));
                }
            }
        }
    }
    return f;
}