Recently, I am studying Symbian development. When I want to use CDirectScreenAccess to draw on the device directly, there occurs the question.
My code is below :
//MySnakeAppView.h
class CMySnakeAppView : public CCoeControl
{
...
private:
void ConstructL(const TRect& aRect);
CDirectScreenAccess* iDSA;
void Restart(RDirectScreenAccess::TTerminationReasons aReason);
void AbortNow(RDirectScreenAccess::TTerminationReasons aReason);
void DrawGraphics();
...
}
//MySnakeAppView.cpp
void CMySnakeAppView::ConstructL(const TRect& aRect)
{
// Create a window for this application view
CreateWindowL();
// Set the windows size
SetRect(aRect);
// Activate the window, which makes it ready to be drawn
ActivateL();
CEikonEnv* env = CEikonEnv::Static();
iDSA = CDirectScreenAccess::NewL(env->WsSession(), *env->ScreenDevice(), Window(), *this);
iDSA->StartL();
DrawGraphics();
}
void CMySnakeAppView::DrawGraphics()
{
CFbsBitGc *gc = iDSA->Gc();
TRgb colorRed = AKN_LAF_COLOR(35);
gc->SetPenColor(colorRed);
gc->DrawRect(TRect(0,0,100,100));
iDSA->ScreenDevice()->Update();
}
void CMySnakeAppView::Restart(RDirectScreenAccess::TTerminationReasons aReason)
{
iDSA->StartL();
DrawGraphics();
}
void CMySnakeAppView::AbortNow(RDirectScreenAccess::TTerminationReasons aReason)
{
iDSA->Cancel();
}
when I build this project, it is wrong with the code
iDSA = CDirectScreenAccess::NewL(env->WsSession(), *env->ScreenDevice(), Window(), *this);
this is a mistake writing that :
'MDirectScreenAccess &'
- illegal implicit conversion from
'CMySnakeAppView' to
but when I do it like this ：
iDSA = CDirectScreenAccess::NewL(env->WsSession(), *env->ScreenDevice(), Window(), (MDirectScreenAccess &)*this);
there is no mistake in building,but still have mistake in the project, I don't know why,I need your help
Your CMySnakeAppView should derive from MDirectScreenAccess - it looks like you're already implementing the right methods, you're just missing the declaration:
class CMySnakeAppView : public CCoeControl, public MDirectScreenAccess
You can't pass *this, because it is not an istance of a MDirectScreenAccess class nor an istance of a class that inherits from it. You can cast it manually, but that is an error. You should construct a class that inherits from MDirectScreenAccess and from there build the iDSA. Look at here:
http://www.developer.nokia.com/Community/Wiki/Anti-tearing_with_CDirectScreenBitmap
Related
My test code to excercise various functions of JavaParser:
public class test001 {
public static void main(String[] args) {
test001 t = new test001();
t.run();
}
#sample.mkGetSet
int g1;
#sample.start
test001(){
g1 = 14;
}
#sample.funky
void run() {
#sample.flagVar
int a,b,c;
a=1;
b=2;
c=a+b;
c=c+g1;
System.out.println("result:"+c);
}
}
My code correctly notes that I call println in the method run.
Is there a fairly easy way to get the 'System.out.' part in addition to the println part?
In the case where the qualification is not there, I dont need it but if it is i would like it.
The type of answer I'm looking for is along the line of 'In the MethodCallExpr look at XXXXX' (with the obligatory admonition to RTFD)
I've been over the documentation and its still not clear how to do this - or if i even can.
I'm making a basic IntelliJ plugin that lets a user define Run Configuration (following the tutorial at [1]), and use said Run Configurations to execute the file open in the editor on a remote server.
My Run Configuration is simple (3 text fields), and I have it all working, however, after editing the Run Configuration, and click "Apply" or "OK" after changing values, the entered values are lost.
What is the correct way to persist and read-back values (both when the Run Configuration is re-opened as well as when the Run Configuration's Runner invoked)? It looks like I could try to create a custom persistence using [2], however, it seems like the Plugin framework should have a way to handle this already or at least hooks for when Apply/OK is pressed.
[1] https://www.jetbrains.org/intellij/sdk/docs/tutorials/run_configurations.html
[2] https://www.jetbrains.org/intellij/sdk/docs/basics/persisting_state_of_components.html
Hopefully, this post is a bit more clear to those new to IntelliJ plugin development and illustrates how persisting/loading Run Configurations can be achieved. Please read through the code comments as this is where much of the explanation takes place.
Also now that SettingsEditorImpl is my custom implementation of the SettingsEditor abstract class, and likewise, RunConfigurationImpl is my custom implementation of the RunConfigiration abstract class.
The first thing to do is to expose the form fields via custom getters on your SettingsEditorImpl (ie. getHost())
public class SettingsEditorImpl extends SettingsEditor<RunConfigurationImpl> {
private JPanel configurationPanel; // This is the outer-most JPanel
private JTextField hostJTextField;
public SettingsEditorImpl() {
super();
}
#NotNull
#Override
protected JComponent createEditor() {
return configurationPanel;
}
/* Gets the Form fields value */
private String getHost() {
return hostJTextField.getText();
}
/* Copy value FROM your custom runConfiguration back INTO the Form UI; This is to load previously saved values into the Form when it's opened. */
#Override
protected void resetEditorFrom(RunConfigurationImpl runConfiguration) {
hostJTextField.setText(StringUtils.defaultIfBlank(runConfiguration.getHost(), RUN_CONFIGURATION_HOST_DEFAULT));
}
/* Sync the value from the Form UI INTO the RunConfiguration which is what the rest of your code will interact with. This requires a way to set this value on your custom RunConfiguration, ie. RunConfigurationImpl##setHost(host) */
#Override
protected void applyEditorTo(RunConfigurationImpl runConfiguration) throws ConfigurationException {
runConfiguration.setHost(getHost());
}
}
So now, the custom SettingsEditor, which backs the Form UI, is set up to Sync field values In and Out of itself. Remember, the custom RunConfiguration is what is going to actually represent this configuration; the SettingsEditor implementation just represents the FORM (a subtle difference, but important).
Now we need a custom RunConfiguration ...
/* Annotate the class with #State and #Storage, which is used to define how this RunConfiguration's data will be persisted/loaded. */
#State(
name = Constants.PLUGIN_NAME,
storages = {#Storage(Constants.PLUGIN_NAME + "__run-configuration.xml")}
)
public class RunConfigurationImpl extends RunConfigurationBase {
// Its good to 'namespace' keys to your component;
public static final String KEY_HOST = Constants.PLUGIN_NAME + ".host";
private String host;
public RunConfigurationImpl(Project project, ConfigurationFactory factory, String name) {
super(project, factory, name);
}
/* Return an instances of the custom SettingsEditor ... see class defined above */
#NotNull
#Override
public SettingsEditor<? extends RunConfiguration> getConfigurationEditor() {
return new SettingsEditorImpl();
}
/* Return null, else we'll get a Startup/Connection tab in our Run Configuration UI in IntelliJ */
#Nullable
#Override
public SettingsEditor<ConfigurationPerRunnerSettings> getRunnerSettingsEditor(ProgramRunner runner) {
return null;
}
/* This is a pretty cool method. Every time SettingsEditor#applyEditorTo() is changed the values in this class, this method is run and can check/validate any fields! If RuntimeConfigurationException is thrown, the exceptions message is shown at the bottom of the Run Configuration UI in IntelliJ! */
#Override
public void checkConfiguration() throws RuntimeConfigurationException {
if (!StringUtils.startsWithAny(getHost(), "http://", "https://")) {
throw new RuntimeConfigurationException("Invalid host");
}
}
#Nullable
#Override
public RunProfileState getState(#NotNull Executor executor, #NotNull ExecutionEnvironment executionEnvironment) throws ExecutionException {
return null;
}
/* This READS any prior persisted configuration from the State/Storage defined by this classes annotations ... see above.
You must manually read and populate the fields using JDOMExternalizerUtil.readField(..).
This method is invoked at the "right time" by the plugin framework. You dont need to call this.
*/
#Override
public void readExternal(Element element) throws InvalidDataException {
super.readExternal(element);
host = JDOMExternalizerUtil.readField(element, KEY_HOST);
}
/* This WRITES/persists configurations TO the State/Storage defined by this classes annotations ... see above.
You must manually read and populate the fields using JDOMExternalizerUtil.writeField(..).
This method is invoked at the "right time" by the plugin framework. You dont need to call this.
*/
#Override
public void writeExternal(Element element) throws WriteExternalException {
super.writeExternal(element);
JDOMExternalizerUtil.writeField(element, KEY_HOST, host);
}
/* This method is what's used by the rest of the plugin code to access the configured 'host' value. The host field (variable) is written by
1. when writeExternal(..) loads a value from a persisted config.
2. when SettingsEditor#applyEditorTo(..) is called when the Form itself changes.
*/
public String getHost() {
return host;
}
/* This method sets the value, and is primarily used by the custom SettingEditor's SettingsEditor#applyEditorTo(..) method call */
public void setHost(String host) {
this.host = host;
}
}
To read these configuration values elsewhere, say for example a custom ProgramRunner, you would do something like:
final RunConfigurationImpl runConfiguration = (RunConfigurationImpl) executionEnvironment.getRunnerAndConfigurationSettings().getConfiguration();
runConfiguration.getHost(); // Returns the configured host value
See com.intellij.execution.configurations.RunConfigurationBase#readExternal as well as com.intellij.execution.configurations.RunConfigurationBase#loadState and com.intellij.execution.configurations.RunConfigurationBase#writeExternal
I'm working on a project for an intro to programming class, and I've run into a slight problem. We're making a side scroller, and I'm working on the score counter right now. My issue is that when I try to create a reference to the counter class in anything other than the act method(called once every frame) I get a null pointer exception error. You can download the zip file with my code in it here if you want to take a look.
EDIT:
Here's the offending code:
public class HeroMissile extends Missiles
{
/**
* Act - do whatever the HeroMissile wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public void act()
{
move(8);
remove();
}
public void remove() {
if(isTouching(Drone.class)) {
removeTouching(Drone.class);
getWorld().addObject(new Explosion(), getX(), getY());
getWorld().removeObject(this);
addScore();
return;
}
}
public void addScore() {
City cityWorld = (City) getWorld();
**Counter scoreCounter = cityWorld.getCounter();**
scoreCounter.add(1);
}
}
You are calling getWorld() [in addScore()] after you removed yourself from the world. In this case, getWorld() will return null, so you will get a null pointer exception. Try changing the order in remove() to add the score before you remove yourself from the world.
I have a custom launch configuration. It currently has a JavaArgumentsTab() where I can enter things for VM arguments and Program arguments. But how do I actually get any values entered there?
Ideally I would get them inside my LaunchConfigurationDelegate's launch() method. I expected to find any text entered as arguments inside the LaunchConfiguration or other parameters to that method, and I'm sure this is a newbie question, but I really haven't found anything promising.
TabGroup:
public class LaunchConfigurationTabGroup extends AbstractLaunchConfigurationTabGroup {
#Override
public void createTabs(ILaunchConfigurationDialog dialog, String mode) {
ILaunchConfigurationTab[] tabs = new ILaunchConfigurationTab[] {
new JavaArgumentsTab(),
new CommonTab()
};
setTabs(tabs);
} }
LaunchConfigurationDelegate:
public class LaunchConfigurationDelegate implements ILaunchConfigurationDelegate {
#Override
public void launch(ILaunchConfiguration configuration, String mode,
ILaunch launch, IProgressMonitor monitor) throws CoreException {
// How to get anything entered on my Java tab here...?
} }
Everything from the tabs should already have been set as attribute values in the ILaunchConfiguration when launch is called.
The settings from JavaArgumentsTab are stored in the attributes using constants from IJavaLaunchConfigurationConstants.
In my title screen, i have a code saying that the first controller using A is the PlayerIndex.one.
Here is the code:
public override void HandleInput(InputState input)
{
for (int anyPlayer = 0; anyPlayer <4; anyPlayer++)
{
if (GamePad.GetState((PlayerIndex)anyPlayer).Buttons.A == ButtonState.Pressed)
{
FirstPlayer = (PlayerIndex)anyPlayer;
this.ExitScreen();
AddScreen(new Background());
}
}
}
My question is: How can i use the "FirstPlayer" in other classes? (without this, there is no interest in this code)
I tried the Get Set thing but i can't make it work. Does i need to put my code in another class? Do you use other code to make this?
Thanks.
You can make a static variable say : SelectedPlayer,
and assign first player to it!
then you can call the first player through this class,
for example
class GameManager
{
public static PlayerIndex SelectedPlayer{get;set;}
..
..
..
}
and right after the loop in your code, you can say:
GameManager.SelectedPlayer = FirstPlayer;
I hope this helps, if your code cold be clearer that would be easier to help :)
Ok, so to do this properly you're going to have to redesign a little.
First off, you should be checking for a new gamepad input (i.e. you should be exiting the screen only when 'A' has been newly pressed). To do this you should be storing previous and current gamepad states:
private GamePadState currentGamePadState;
private GamePadState lastGamePadState;
// in your constructor
currentGamePadState = new GamePadState();
lastGamePadState = new GamePadState();
// in your update
lastGamePadState = currentGamePadState;
currentGamePadState = GamePad.GetState(PlayerIndex.One);
Really what you need to do is modify your class that deals with input. The basic functionality from your HandleInput function should be moved into your input class. Input should have a collection of functions that test for new/current input. For example, for the case you posted:
public Bool IsNewButtonPress(Buttons buton)
{
return (currentGamePadState.IsButtonDown(button) && lastGamePadState.IsButtonUp(button));
}
Then you can write:
public override void HandleInput(InputState input)
{
if (input.IsNewButtonPress(Buttons.A)
{
this.ExitScreen();
AddScreen(new Background());
}
}
Note: this will only work for one controller. To extend the implementation, you'll need to do something like this:
private GamePadState[] currentGamePadStates;
private GamePadState[] lastGamePadStates;
// in your constructor
currentGamePadStates = new GamePadState[4];
currentGamePadStates[0] = new GamePadState(PlayerIndex.One);
currentGamePadStates[1] = new GamePadController(PlayerIndex.Two);
// etc.
lastGamePadStates[0] = new GamePadState(PlayerIndex.One);
// etc.
// in your update
foreach (GamePadState s in currentGamePadStates)
{
// update all of this as before...
}
// etc.
Now, you want to test every controller for input, so you'll need to generalise by writing a function that returns a Bool after checking each GamePadState in the arrays for a button press.
Check out the MSDN Game State Management Sample for a well developed implementation. I can't remember if it supports multiple controllers, but the structure is clear and can easily be adapted if not.