Sign in to follow this  
thefollower

SFML Mouse event

Recommended Posts

Hey

I'm having an issue trying to get my button to change image when the mouse is hovering over it, i don't know where I am going wrong was hoping some could help.

The button does display, but does not change when the mouse is over it.


My class is like this:

[b][u]For some reason, i cannot get the code to display properly... can a mod please check if this is a bug.[/u][/b]

[source lang="cpp"]

#include <SFML/Graphics.hpp>
#include <string>

class Button
{
private:
int m_x, m_y;
int m_w, m_h;


public:
Button(int x, int y)
{
m_x = x;
m_y = y;
}

bool IsIn( int mouseX, int mouseY )
{
if (((mouseX > m_x) &amp;amp;&amp;amp; (mouseX < m_x + m_w))
&amp;amp;&amp;amp; ((mouseY > m_y) &amp;amp;&amp;amp; (mouseY < m_y + m_h ) ) ) {
return true;
} else {
return false;
}
}

void RenderBttn(sf::RenderWindow &amp;amp;destination,int mouseX, int mouseY)
{
std::string img = "button.png";
sf::Texture button;
if (!button.loadFromFile(img)){
exit(4);
}

std::string img_on = "button_on.png";
sf::Texture button_on;
if (!button.loadFromFile(img_on)){
exit(5);
}

sf::Sprite sprite(button);
m_w = sprite.getLocalBounds().width;
m_h = sprite.getLocalBounds().height;

if(IsIn(mouseX,mouseY)){
sf::Sprite sprite(button_on);
} else {
sf::Sprite sprite(button);
}

sprite.setPosition(m_x,m_y);
destination.draw(sprite);
}
};

[/source]

I should note im not sure if my approach is the best way ??



My main loop has:

[source lang="cpp"]

Button btn_quit(window.getSize().y/2, 200);


// Start the loop
while (window.isOpen())
{
// Process events
sf::Event event;
while (window.pollEvent(event))
{
// Close window : exit
if (event.type == sf::Event::Closed) {
window.close();
}
}

// Clear screen
window.clear();

// Draw the background sprites
window.draw(sprite);
window.draw(lsprite);

//render the button also check the mouse position
btn_quit.RenderBttn(window,event.mouseMove.x,event.mouseMove.y);



// Update the window
window.display();
}

[/source]

Hope you can help [img]http://public.gamedev.net//public/style_emoticons/default/smile.png[/img] Edited by thefollower

Share this post


Link to post
Share on other sites
You can't use [i]event.mouseMove.x[/i] and [i]event.mouseMove.y[/i] outside of your "[i]while(window.pollEvent(event))[/i]" loop.

You can [b]*only*[/b] use those member variables within the loop, and [b]*only*[/b] if "[i]event.type == sf::Event::MouseMoved[/i]" for that specific iteration of the loop.
[url="http://www.sfml-dev.org/tutorials/2.0/window-events.php"]SFML 2.0 tutorial: Window events[/url]

How about adding a "[i]UpdateMousePos(int mouseX, int mouseY)[/i]" function to your button class to read and store the location of the mouse?
Then [u]within your poll-event loop[/u], and only when "event.type == sf::Event::MouseMoved", you could call [i]button.[/i][i]UpdateMousePos[/i][i](event.mouseMove.x, event.mouseMove.y); [/i]to update the button's view of the last known mouse position.

Or you could just use the global function [url="http://www.sfml-dev.org/documentation/2.0/classsf_1_1Mouse.php"]sf::Mouse::getPosition()[/url] within your button, without worrying about all that - it'd be the easiest option.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this