In the previous exercise, we allowed a user to click on the user interface squares. When a square was clicked, we invoked the uncover method on the backend Board object and also changed the display to show the count or to end the game if a mine is uncovered.
This is a great first step, but if you have noticed, we supported only left clicks. In a real game several more things need to happen. We need to detect whether a click is a left click or a right click. If the click is a left click then the backend square must be uncovered, and if it is a right click, then the square must be marked as a mine.
By now, we already know what happens when a user performs a left click on a Square. On the other hand if a user performs a right click on a square, then the backend Board object's mark method is called and the user interface square is displayed in MAGENTA.
In this activity we need to code the latter. However, if you remember from a very early exercise, there are some rules of working with squares. We will list them below once again, for your recollection.
A Square can either be uncovered, or marked as a mine. The rules for what should happen are as follows:
- If a Square which is already uncovered is uncovered again, the action is ignored
- If a Square which is already uncovered is is marked as a mine, the action is ignored
- If a Square which is marked as a mine, is uncovered, the action is ignored
- If a Square which is marked as a mine, is again marked as a mine, then it becomes unmarked
The backend logic for all these rules is already in place in the Square class. You have to incorporate all this in UI by invoking the correct backend method and changing how the square on the user interface is rendered. Look at the layoutSquares method in UI.java and fill in your code under the TODO: comment.
- Run
AllTestsand verify that 48 tests are run, out of which 6 tests fail - Implement appropriate code in
layoutSquaresmethod inUI.java - Run
AllTestsand verify that all 48 tests pass